[161] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
5. The spermatophore sac (ss) is a long, capacious, pyriform, or some- 
what fusiform, thin-walled sac, pointed at its posterior end; its anterior 
end is directly continuous with the long efferent duct (p), which is often 
rather wide at its origin but tapers to a narrow anterior end. The ter- 
ininal orifice is slightly bilabiate. 
These organs receive blood through a special artery (fig. 2, po) which 
arises from the posterior aorta just back of the heart. After reaching 
the genital organ it divides into several branches; one going forward 
along the side of the efferent duct; one to the prostate glands and 
vesiculz-seminales; one to the vas-deferens and adjacent parts. 
Specimens taken in May, in the breeding season, have the efferent 
duct and the spermatophore-saec 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 al- 
cohol) from 8 to 10™™ in length and 4 to 5™™ in the greatest diameter. 
They contain a coiled rope of spermatozoa in the larger end and a com- 
plicated apparatus for automatically ejecting this.rope in the smaller 
portion. 
The “testicle” or spermary (ft) is a compact, pale yellow, long, flat- 
tened 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, 
contmuous with its sheath, extends from its posterior end into the hol- 
low tip of the pen, to which it is attached. An arterial vessel, the sper- 
matic artery (Pl. 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, ¢). This 
artery is accompanied by a spermatic vein (sv), closely united to it. 
Loligo brevis Blainville. 
Loligo brevis Blainv., Journ. de Phys., March, 1823 (t. D’Orb.); Dict. des Sci. 
- nat., vol. xxvii, p. 145, 1823. 
D’Orbigny, Céphal. Acétab., p. 314, Loligo, pl. 18, figs. 4-6 (copied from 
Lesueur); pl. 15, figs. 1-3 (orig.); pl. 24, figs. 14-19 (orig.). 
Tryon, Marine Conch., i, p. 142, pl. 52, figs. 143, 144 (after D’Orbigny). 
Verrill, Trans. Conn. Acad., v, p. 348, 1881. ; 
Loligo brevipinna Lesueur, Journ. Acad. Nat. Sci. Philad. , Vol. iii, p. 28 (with 
plate), 1824. 
Tryon, Manual Conch., i, p. 142, pl. 51, figs. 128-130 (after Lesueur). 
Plate XXI, figures 4=4c. 
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 
