VAN NAME: SIMPLE ASCIDIANS. 543 
was about as follows in the medium-sized of the three specimens 
whose dimensions are given above: 
mdv. 2 (9) 3 (8) 2 (10) 3 (8) 3 (G) 2 (4) 1 en. 
The largest of the three specimens had more vessels (at least twelve 
on some folds and four on some interspaces) but the branchial sac was 
not dissected out for a careful study. 
The alimentary tract forms a loop of moderate length and width, 
the rectum bending abruptly dorsally. The stomach is long, tapering 
gradually into the intestine, and is provided with a row of many- 
lobed yellowish hepatic glands along each side. The anus was con- 
spicuously though irregularly lobed in one specimen, but only slightly 
so in another. * 
Gonads were found well developed only in the two larger specimens 
whose measurements are given above. There are two on each side 
of the body. On the left side one of them lies within the space sur- 
rounded by the intestinal loop, the other dorsal to the intestine. In 
the largest individual the gonads were all greatly elongated, and con- 
stricted at intervals so as to form a chain of rounded masses, at least 
six in number, connected like a string of beads. In the smaller 
individual the gonads were only moderately elongated and exhibited 
but little tendency to constriction into segments, though this is 
perhaps largely due to their being greatly distended with the sexual 
products. The ovary occupies the whole length of the organ on the 
side attached to the mantle, including the constricted portions; the 
small, usually two- or three-lobed testes are chiefly found in the super- 
ficial parts of the enlarged segments. The sexual ducts were not 
satisfactorily traced, but apparently the ovary terminates in a narrow 
neck with a lobed terminal orifice at the posterior end of the whole 
gonad. 
This is a deep-sea species and does not properly belong to the New 
England fauna, but as Professor Verrill's description of C.'tanneri 
dealt only with the external characters, it seemed best to take this 
opportunity to record something in regard to its internal structure. 
The writer finds no sufficient grounds for regarding Verrill's species 
as distinct from Herdman's, which was based on a small specimen 
taken by the Challenger in N. lat. 37^ 25', W. long. 71° 40' (1700 
fathoms, bottom temperature 1.7° C, gray ooze). 
