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"Shell of a Bivalve Mollusk, inner surface. ad.a., depression showing the attachment of the anterior adductor muscle; ad.p., posterior adductor muscle; h, hinge with teeth; l, attachments of the ligaments; p, pallial line, marking the attachment of the mantle muscles; s, the pallial sinus, marking the attachment of the retractor muscles of the siphon; u, umbo or beak." — Galloway

Bivalve Mollusk

"Shell of a Bivalve Mollusk, inner surface. ad.a., depression showing the attachment of the anterior…

Showing the development of the face. F.N.P., Part formed from the frontonasal process; L, from its lateral and M., from its mesial parts; MAX., formed by the maxillary process; MAN., formed by the mandibular process.

Development of the Face

Showing the development of the face. F.N.P., Part formed from the frontonasal process; L, from its lateral…

Superior maxillary bone and the bony sinuses of the head.

Superior Maxillary Bone and Sinuses

Superior maxillary bone and the bony sinuses of the head.

Nasal cavity, right lateral wall, from the left.

Nasal Cavity

Nasal cavity, right lateral wall, from the left.

Transverse vertical section of the nasal cavities and accessory sinuses.

Nasal Cavity and Accessory Sinuses

Transverse vertical section of the nasal cavities and accessory sinuses.

The nasal cavity with openings of accessory sinuses. The sagittal section has been made a little to the right of the nasal septum sphenoidal and frontal septum. Portions have been removed from the turbinated bones in order to exhibit the orifices of the accessory cavities. The tongue has been almost completely removed to show the tonsils.

Nasal Cavity with Openings of Accessory Sinuses

The nasal cavity with openings of accessory sinuses. The sagittal section has been made a little to…

The inner wall of the nasal fossae, or septum of the nose.

Nasal Fossae

The inner wall of the nasal fossae, or septum of the nose.

Nasal septum as seem from the left side.

Nasal Septum

Nasal septum as seem from the left side.

Vertical coronal section through the nose and frontal sinuses.

Section Through Nose and Frontal Sinuses

Vertical coronal section through the nose and frontal sinuses.

"Anatomy of the Oyster. A. Hinge or anterior umbonal end of the left valve of an adult oyster, upon which the soft parts of the animal are represented as they lie in situ, but with the greater part of the mantle of the right side removed. a u. The auricle of the right side of the heart contracted. B. Posterior or ventral end of the left valve, which in life is usually directed upward more or less, and during the act of feeding and respiration is separated slightly from the margin of its fellow of the opposite side to admit the water for respiration, and which also contains the animal's food in suspension. b m. Body-mass, traversed superficially by the generative ducts g e. b j. The organ of Bojanus, or 'renal' organ, of the right side of the oyster. (The ducts which it sends into the manle are not shown, nor is its connection with the genito-urinary sinus s indicated.)" — Winston's Encyclopedia, 1919

Oyster

"Anatomy of the Oyster. A. Hinge or anterior umbonal end of the left valve of an adult oyster, upon…

Exposure of the right maxillary sinus, after removal of facial muscles. The (*) indicates the opening (Ostium maxillare) of the maxillary sinus into the nose.

Dissection of the Maxillary Sinus

Exposure of the right maxillary sinus, after removal of facial muscles. The (*) indicates the opening…

Right pterygopalatine fossa, from without. The greater portion of the ala magna oss. sphenoid., of the lateral part of the corpus maxillae and of the pars orbit. oss. front. have been removed by a sagittal section, exposed the medial wall of the sinus maxillaris and of the orbit. Labels: **, indicate a probe through the Foramen rotundum; *, indicates a probe through the Canalis pterygoideus.

Pterygoid Fossa and Maxillary Sinus

Right pterygopalatine fossa, from without. The greater portion of the ala magna oss. sphenoid., of the…

This illustration shows the base of the skull. The inner or cerebal surface.

Skull

This illustration shows the base of the skull. The inner or cerebal surface.

This illustration shows the external surface of the skull.

Skull

This illustration shows the external surface of the skull.

This illustration shows the anterolateral region of the skull.

Skull

This illustration shows the anterolateral region of the skull.

The coronal section through the frontal sinus and nasal fossa.

Skull

The coronal section through the frontal sinus and nasal fossa.

Front section of skull through plane of outer border of orbits. Arrows pass through communication between atrum and middle meatus.

Frontal Section of Skull Showing Nasal Cavity

Front section of skull through plane of outer border of orbits. Arrows pass through communication between…

Inner aspect of outer wall of right nasal fossa.

Side View of Skull Showing Nasal Cavity

Inner aspect of outer wall of right nasal fossa.

Shown is a coronal section passing inferiorly through interval between between the first and second molar teeth. Labels: 1, groove of superior longitudinal sinus; 2,crest for attachment of falx cerebri; 3, crista galli of ethmoid; 4, cristiform plate of ethmoid; 5, perpendicular plate of ethmoid, assisting in the formation of nasal septum; 6, lateral mass of ethmoid consisting of the ethmoidal cells; 7, os planum of ethmoid; 8, middle meatus of nose; 9, middle turbinated bone; 10, opening from the middle meatus; 11, orbital plate of superior maxilla; 12, frontomalar suture; 13, infraorbital groove; 14, antrum or maxillary sinus; 15, canal for anterior dental nerve and vessels exposed; 16, inferior meatus of nose; 17, alveolar process of the superior maxilla; 18, nasal surface of inferior turbinated bone; 19, groove for anterior palatine nerve and vessels; 20, palatal process of superior maxilla; 21, maxillary crest forming part of nasal septum; 22, vomer forming part of nasal septum.

Coronal Section of Skull

Shown is a coronal section passing inferiorly through interval between between the first and second…