342 
A. E. Verrill — North American Cephalopocls. 
position, on the left side, as the terminal part of the oviduct of the 
female. It is, however, a much more slender tube, extending farther 
forward beyond the base of the gill, and its orifice is small and simply 
bilabiate. It extends backward, over the dorsal side of the base of the 
gill, to a bilobed, long-pyriform organ, consisting of a spermatophore- 
sac (ss) and a complicated system of glands and ducts (pr, vd), 
united closely together and enclosed in a special sheath ; in these the 
spermatophores are formed. These organs consist of the following 
parts : 
1. The vas-deferens (vd), which starts posteriorly from a small 
orifice (not figured) in the thin sheath of peritoneal membrane ( pt ) 
investing the testicle (£); it passes forward along the side of the 
spermatophore-sac, to which it is closely adherent, and throughout 
most of its length it is thrown into numerous close, short, transverse, 
flattened folds; anteriorly it joins the vesiculae-seminales. 
2. The vesiculae-seminales (fig. 2 ,pr, in part) consist of three large 
curved vesicles, closely coiled together, and having thickened, gland- 
ular walls ; the first two are short and broad, the third is elongated ; 
from the latter goes a short duct, which unites with the duct from the 
prostate gland to form the spermatic duct. 
3. The prostate gland (pr, in part) is broad-ovate and consists of 
two rounded lobes, one large and the other small, which are closely 
united to and enclosed between the vesiculae-seminales. 
4. The spermatic duct, formed by the union of the ducts from the 
vesiculae-seminales and prostate glands, is a nearly straight tube ; 
it passes backward between the prostate glands and spermatophore- 
sac, close alongside of the vas-deferens (vd), to which it is closely 
bound down ; it enters the spermatophore-sac (ss) near its posterior end, 
at an acute angle. Even at its origin it contains spermatophores. 
5. The spermatophore-sac (ss) is a long, capacious, pyriform or 
somewhat 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 ante- 
rior end. The terminal 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 organs it divides into several branches : one 
goes forward along the side of the efferent duct ; one to the pi-os- 
tate glands and vesiculte-seminales ; one to the vas-deferens and 
adjacent parts. 
Specimens taken in May, in the breeding season, have the efferent 
