ClipArt ETC
"Acorn-shell (Balanus tintinnabulum). T., tergum; CR., thoracic legs; R., outer shell in section; D., aperture of oviduct; F., mantle cavity; X., depressor muscle of tergum; AN., antennae; OV., ovary; G., depressor of scutum; H., oviduct; AM., adductor muscle of scuta; S., scutum." -Thomson, 1916

Acorn Shell

"Acorn-shell (Balanus tintinnabulum). T., tergum; CR., thoracic legs; R., outer shell in section; D.,…

"An Amphipod (Caprella linearis). The two anterior thoracic segments are fused to the head; he abdomen is greatly reduced and without appendages; the fourth and fifth thoracic segments bear only respiratory plates." -Thomson, 1916

Amphipod

"An Amphipod (Caprella linearis). The two anterior thoracic segments are fused to the head; he abdomen…

"Anaspides. A.1, A.2, antennae; Ex., rudimentary exopodite; G., respiratory lamina; PR.7, PR.8, seventh and eighth thoracic limbs or pereiopods; PL.1, 2, 6, first second, and sixth abdominal limbs or pleopods." -Thomson, 1916

Anaspides

"Anaspides. A.1, A.2, antennae; Ex., rudimentary exopodite; G., respiratory lamina; PR.7, PR.8, seventh…

"Cyclops type. I A., first antenna; II A., second antenna; OV., ovary; R.S., receptaculum seminis; OS., ovisac; F., caudal fork." -Thomson, 1916

Cyclops

"Cyclops type. I A., first antenna; II A., second antenna; OV., ovary; R.S., receptaculum seminis; OS.,…

"Cypris, side view, after removal of one valve. e., Eye; A.1, first antennae; A.2, second antennae; MN., mandibles; mx.1, first maxilla; mx.2, second maxilla; f.1, f.2, thoracic legs; Ab., rudimentary abdomen." -Thomson, 1916

Cypris

"Cypris, side view, after removal of one valve. e., Eye; A.1, first antennae; A.2, second antennae;…

"Daphnia. E., Eye; A.2, second antenna; A.1, first antenna; dg., digestive caeca; s.g., shell gland; go., gonad; h., heart in pericardium; o., ovum; B.p., brood-pouch; sp., spine; f., furca; s., setae; Ab., rudimentary abdomen; t., caudal fork; g., gut; 1-5, thoracic limbs." -Thomson, 1916

Daphnia

"Daphnia. E., Eye; A.2, second antenna; A.1, first antenna; dg., digestive caeca; s.g., shell gland;…

"Hermit-crab withdrawn from its shell. The anterior appendages are broken off. hd., Head; th., thorax; abd., abdomen." -Thomson, 1916

Hermit Crab

"Hermit-crab withdrawn from its shell. The anterior appendages are broken off. hd., Head; th., thorax;…

"Mysis flexuosa, from side. b., Brood-pouch borne on posterior thoracic limbs; o., otocyst in tail. Note eight pairs of similar biramose thoracic feet. The last two thoracic segments are not covered by the shield." -Thomson, 1916

Mysis Flexuosa

"Mysis flexuosa, from side. b., Brood-pouch borne on posterior thoracic limbs; o., otocyst in tail.…

"Nebalia. SH., Shell; A.1, first antennae; A.2, second antennae; TH., 8 thoracic limbs; Ab.4, Ab.6, fourth and sixth abdominal limbs." -Thomson, 1916

Nebalia

"Nebalia. SH., Shell; A.1, first antennae; A.2, second antennae; TH., 8 thoracic limbs; Ab.4, Ab.6,…