ClipArt ETC
"<em>A</em>, epithelial lining wall; <em>B</em>, partition between two adjacent sacs, in which run capillaries; <em>C</em>, fibers of elastic tissues." &mdash; Blaisedell, 1904

Diagrammatic view of an air sac

"A, epithelial lining wall; B, partition between two adjacent sacs, in which run capillaries;…

<em>A</em> and <em>C</em>, lachrymal canals; <em>B</em>, lachrymal sac; <em>D</em>, small muscle which serves to compress the lachrymal sac; <em>F</em>, glands upon the inner surface of the eyelids, with ducts opening upon the free margins of the eyelids; <em>H</em>, great openings, or antrum, of the upper jawbone. The oil glands of the nose are plainly shown." &mdash; Blaisedell, 1904

Eyelids and lachrymal apparatus

A and C, lachrymal canals; B, lachrymal sac; D, small muscle which…

"<em>A</em>, an air sac; <em>B</em>, an air sac cut open; <em>C</em>, capillary network over an air sac; <em>D</em>, branch of pulmonary artery; <em>E</em>, branch of pulmonary vein; <em>F</em>, bronchial tube." &mdash; Blaisedell, 1904

Lobule of the lung

"A, an air sac; B, an air sac cut open; C, capillary network over an air…

The genus Cystophora includes the large bladder-nose, hooded or crested seal of the Greenland seas, in which the nose of the males has a curious dispensable sac, and which attains an average length of from 10 to 12 feet.

Hooded Seal

The genus Cystophora includes the large bladder-nose, hooded or crested seal of the Greenland seas,…

"<em>A</em>, simple tubular gland; <em>B</em>, gland with mouth shut and sac formed; <em>C</em> gland with a coiled tube; <em>D</em>, plan of part of a racemose gland." &mdash; Blaisedell, 1904

Secreting glands

"A, simple tubular gland; B, gland with mouth shut and sac formed; C gland…