10 SIR CHARLES ELIOT. 
than 7 mm. wide. In the upper part are soft lamellz and papillee, and in the lower a 
ring of fifteen to twenty hard ridges, which look like the stomach plates of Marionia, 
but are not detachable. The circuit of plates is broken by the large liver duct which 
enters the stomach at about this point. The hinder part, but not the whole, of 
the stomach is enclosed in the greyish liver mass, which is itself covered here 
and there, but by no means everywhere, by a thick reddish layer consisting of the 
follicles of the hermaphrodite gland. The intestine is laminated internally. It 
issues from the middle of the liver mass, runs a long way forward, and then turns 
backward and to the right. In one specimen fragments of shells were found in the 
digestive organs. 
The ampulla of the hermaphrodite gland is long (about 25 mm. x 4 mm., if 
straightened out), and folded about four times on itself. The vas deferens is 
reddish yellow, and lies in a few large, loose coils (about 40 mm. x 1°5 mm., if 
straightened out). The verge is rather small, conical, and pointed. The mucous 
and albumen glands are not large in any of the specimens, and it is probable 
that the animals were not captured in the breeding season. The spermatotheca 
has a short duct (2°5 mm.), and is elongate (about 8 mm. x 2 mm.), with 
strong, muscular walls. In all the specimens it is contracted and twisted in the 
middle. The external orifices of the reproductive organs are protected by folds of 
moderate size. 
The renal orifice, which lies immediately in front of the vent, is remarkably 
distinct in all the specimens; and in most of them it can be seen that it consists 
of two openings, very close together, the anterior smaller than the posterior. Both 
appear to communicate with the renal apparatus, but the connection was not 
satisfactorily discovered. Attached to the intestine is the reddish, egg-shaped, renal 
vesicle, lined with branchia-like lamelle. 
3. TRITONIELLA sINuATA (Fig. C). 
ONE specimen, captured at Winter Quarters on October 8, 1903, with the 
D net in hole 12 (25-30 fathoms). It is of a uniform, light-yellow colour, and 
well preserved, but swollen ventrally, which is probably unnatural. It is narrower 
and higher than the specimen of T°. belli, the measurements being: length, 30 mm. ; 
breadth, 10°5; height, 12. 
The dorsal margin rises vertically, not laterally, about 5 mm., and bears on each 
side 30 points, which are continued below into low ridges, running towards the 
centre of the back, but not reaching the central ridge. It is not clear if these 
transverse ridges are permanent, or mere folds produced by contraction. Three 
of the points are larger than the others, and measure 4 mm., including the ridges; 
five are of moderate size (3 mm., including the ridges), and the rest are small. On 
the under side of the points are a few indistinct lamelle. 
The oral veil is bi- or trilobed, as the central portion is somewhat expanded 
