REPORT OF COMMISSIONER OF FISH AND FISHERIES. [160] 
lamellae. Two very large, oblong, accessory nidamental glands (xx) lie 
side by side, loosely attached, nearly in the middle of the ventral side, 
covering and concealing the heart and most of the renal organs; each 
of these has a groove along the ventral side and a slit in the anterior 
end; internally they are composed of great numbers of thin lamellae. 
In front of and partially above the anterior ends of these, and attached 
to the intestine and ink-sac, there is another pair of accessory glands (x) r 
roundish in form, with a large ventral opening, and having, in fresh 
specimens, a curiously mottled color, consisting of irregular red and 
dark brown blotches on a pale ground. Their internal structure is finely 
follicular. The ovary ( ov) is large and occupies a large portion of the 
cavity of the body, posteriorly, running back into the posterior cavity 
of the pen, and in the breeding season extending forward nearly to the 
heart. In the breeding season the thin convoluted portion of the ovi¬ 
duct ( ov') is found distended with great numbers of eggs. At the same 
time the large glands ( x'), around the oviduct, and the accessory nida¬ 
mental glands (x, xx), destined to furnish the materials for the formation 
of the egg-capsules, and for their attachment, are very turgid and much 
larger than at other, times. 
The male (PI. XL, figs. 1,2) has no organs corresponding in position to 
the two pairs of accessory nidamental glands of the female, but the 
single efferent spermatic duct (p) occupies the same 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 bdobed, long- 
pyriform organ, consisting of a spermatophore-sac (ss) and a complicated 
system of glands and tubes (pr, vd) united closely together and inclosed 
in a special sheath. This organ consists 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 ( pr) investing 
the testicle ( t ); it passes forward along the side of the spermatophore- 
sac, to which it is closely adherent, and throughout its length it is thrown 
into numerous close, short, transverse, flattened folds; anteriorly it joins 
the vesiculm-seminales. 
2. The vesiculte-seminales (fig. 2, pr, in part) consist of three large, 
curved vesicles, closely coiled together, the third one having thickened, 
glandular walls; from the latter goes a duct which unites with the duct 
from the prostate gland to form the spermatic duct. 
3. The prostate gland (pr, in part) consists of two curved lobes, which 
are closely coiled between and united to the vesicuhe-seminales. 
4. The spermatic duct, formed by the union of the ducts from the 
vesicuke 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. 
