A. E. Verrill — North American Cephalopods. 343 



duct and the spermatophore-sac crowded with the spermatophores. 

 In the spermatophore-sac, which is then much distended by them, 

 they lie closely packed in a longitudinal position, with their larger 

 ends pointing somewhat outward toward the surface, and can be 

 plainly seen through the transparent walls of the sac. 



The spermatophores are slender, club-shaped, with the larger end 

 rounded, tapering gradually to the smaller end, which is usually a 

 little expanded at the tip and has a very small filament. They vary 

 (in alcohol) from 8 to 10'""^ in length and from *4 to •5'"'" in the great- 

 est diameter. They contain a coiled rope of spermatozoa in the larger 

 end, and a complicated apparatus for automatically ejecting this rope, 

 in the smaller portion. 



The 'testicle,' or spermary [t), is a compact, pale yellow, long, 

 flattened organ, extending from the stomach (*S') nearly to the end of 

 the pen, in the posterior concavity of which it lies ; a band of fibrous 

 tissue, continuous with its sheath, extends from its posterior end into 

 the hollow tip of the pen, to which it is attached. An arterial 

 vessel, the spermatic artery (PI. XL, fig. 2, go), which arises directly 

 from the anterior edge of the heart, runs along the median dorsal 

 line of the spermary and sends off" numerous branches to the right 

 and left (fig. 2, t). This artery is accompanied by a spermatic vein 

 which is closely united to it. 



LoligO breviS Blainville. 



Loligo hrevis Blainv., Journ. de Phys., March, 1823 (t. D'Orb.); Diet. des. Sci. nat., 

 vol. xxvii, p. 145, 1823. 

 D'Orbigny, Oephal. Acetab , p. 314, Loligo^ pi. 13, figs. 4-6 (copied from Lesueur), 



pi. 15, figs. 1-3 (orig.); pi. 24, figs. 14-19 (orig.) 

 Tryon, Man. Conch., i, p. 142, pi. 52, figs. 143, 144 (after D'Orbigny.) 

 Loligo hrevipinna Lesueur, Journ. Acad. Nat. Sci. Philad., vol. iii, p. 282, plate 

 10, figs. 1-3, 1824. 

 Tryon, Man. Conch., i, p. 142, pi. 51, figs. 128-130 (after Lesueur.) 



A small, short-bodied species, with short, rounded caudal fins, very 

 short upper arms, and large chromatophoric spots. Body short, 

 thick, well-rounded, rather blunt posteriorly. Anterior edge of 

 mantle with a well-developed median dorsal lobe, and well-marked 

 lateral angles. Fins broad transversely, short, less than half the length 

 of the mantle ; outer edges well-rounded ; posterior end very obtuse. 

 Arms all short, the two upper pairs much shorter than the two 

 lower, the dorsal pair very short, considerably shorter than the 

 upper lateral ones ; ventral and lower-lateral arms nearly equal in 

 length. The dorsal arms are strongly compressed, with a well- 

 marked thin dorsal keel; those of the second pair squarish at base, 



