A. M Verrill — N'orth American Cephalopods. 005 



Notes on the Visceral Anatomy. 

 Plate XXXIX, figure 1. 



The only specimen of this species obtained had the internal organs 

 considerably injured, but the anatomy is so unlike that of the more 

 common genera of squids, that it seemed to me desirable to figure 

 such parts as are preserved. 



This specimen is a female and the large nidamental glands (cc', xx^ 

 xx') are symmetrically developed, on the two sides ; these are swollen, 

 voluminous organs, composed of great numbers of internal lamellte ; 

 the anterior ones (a*') occupy the region around, and in front of the 

 bases of the gills, extending forward and having an oblique, oblong 

 opening [op, op') on the outside of the anterior ends ; the posterior 

 ones [xx, xx') are behind the gills and cover the branchial auricles, 

 the oblique, slit-like opening is on the outside of the posterior ends ; 

 the gland on the left side [xx') was mutilated ; the posterior vena- 

 cava, in front of r', passes through the center of the posterior gland 

 [xx). The ovary [ov) is a very long organ, attached to the stomach 

 [s) and to the sides of its long cjecal appendage; it extends far back- 

 ward to near the tip of the tail, occupying the concavity of the pen 

 [p) ; it consists of great nnmbers of small clustered folicles; con- 

 nected with its anterior end, and attached to the stomach, there is a 

 convoluted tube, probably an oviduct, not shown in the figure ; con- 

 nected with the intestine, near its origin (between s and I), there is a 

 firm, rounded organ (gizzard '?), with internal lamellae, opening into the 

 intestine. The stomach was much mutilated, so that its foi'm could not 

 be certainly made out; its cavity is occupied by niimerous longitudinal 

 folds ; a very long, saccular caecal appendage, longitudinally plicated 

 within, runs back, along the ovary, into the caudal cavity of the 

 pen. The oesophagus had been destroyed. The intestine [I, h) is 

 veiy long and slender, internally longitudinally plicated, and exter- 

 nally covered along nearly its whole length, on one side, by close 

 groups of small, glandular folicles [I, I) ; the posterior portion is 

 closely attached to the ventral edge of the smooth, compressed, 

 oblong-ovate liver [i), and the free, stout, anal end (A) is provided 

 with two slender, tapering cirri. Ink-sac small, pyriform. 



The gills [g, g) are small and short, situated far forward, and con- 

 nected to the ventricle of the heart [H), by long aft'erent vessels 

 [bo)', the branchial auricles [ait, au) are rounded, without terminal cap- 

 sules; the ventricle of the heart [H), as preserved, is small and four- 

 lobed. The largest lobe directed foi-ward and passing into the anterior 

 aorta. The condition of the specimen did not permit the circulation to 



