A. E. Yerrill — North American Cephalopods. 341 



The intestine (A) is a rather wide and thin tnbe, of moderate length ; 

 the anal orifice is provided with two slender, clavate papillae. 

 The ink-sac {i) is large, long-pyriform, with a long tapering duct [i') 

 terminating just within the anal orifice. The liver {I) is a long, 

 rather narrow, somewhat fusiform organ, slightly bilobed anteriorly 

 and pointed posteriorly ; along about two thirds of its length, from 

 the anterior end, there is a deep dorsal groove, in which the oesopha- 

 gus and aorta are situated, before they pass through its substance; 

 the posterior end is simple and pointed. 



In the appearance and structure of the internal reproductive organs 

 the sexes differ greatly. In the female (pi. XL, figs. 3, 3a ; pl.XLI, fig. 

 1), the single large oviduct [od, od'), situated on the left side, passes 

 over the dorsal side of the base of the gill and terminates in a 

 large ear-shaped external oi'ifice (op), nearly surrounded by a broad 

 membranous flap. The portion of the oviduct behind the base of the 

 gill is enveloped by a large, swollen, bilobed, nidamental gland {x'), 

 which is abundantly supplied with blood-vessels, and internally is 

 composed of a large number of thin, close, parallel lamellfe. Two 

 very large, oblong, accessory nidamental glands {xx) lie, side by 

 side, loosely attached, nearly in the middle of the ventral side, cover- 

 ing and concealing the heart and most of the renal organs ; each of 

 these has a groove along the ventral side and a slit in the anterior end ; 

 internally they are composed of great numbers of thin lamelliB. In front 

 of, and partially above the anterior ends of these, and attached to the 

 intestine and ink-sac, there is another pair of accessory glands (x), 

 roundish in form, with a large ventral opening, and having, in fresh 

 specimens, a curiously mottled color, consisting of irregular red and 

 dark brown blotches, on a pale ground. Their internal structure is 

 made up of fine follicles. 



The ovary (ov) is large and occupies a large portion of the cavity 

 of the body posteriorly, running back into the posterior cavity of the 

 pen, and in the breeding season, extending forward nearly to the 

 heart. In the breeding season, the thin convoluted portion of the 

 oviduct {ov') is found distended with great numbers of eggs. At 

 the same time the large glands (.r'), around the oviduct, and the acces- 

 sory nidamental glands (cc, xx), destined to furnish the materials for 

 the formation of the egg-capsules, and for their attachment, are very 

 turgid and much larger than at other times. 



The male (PI. XL, figs. 1, 2) has no organs corresponding in posi- 

 tion to the two pairs of accessory nidamental glands of the female, 

 but the single efferent spermatic duct or ' penis' (p) occupies the same 



