A. E. Yerrill — 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 ram in length and from *4 to *5 mm in the great- 
est diameter. They contain a coiled rope of spermatozoa in the lai’ger 
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 (5) 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 wdiieh 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 oft’ 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 brevis Blainv., Joum. de Phys., March, 1823 (t. D’Orb.); Diet. des. Sci. nat., 
toI. xxvii. p. 145, 1823. 
D’Orbigny, Cephal. 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 brevipinna Lesueur, Joum. 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, 
