6 SIR CHARLES ELIOT. 
T. belli appears to have two renal orifices situated close together. The second is 
possibly analogous to the pore of unknown functions in Hevabranchus (v. Bergh in 
Semper’s Reisen, XVIIL., p. 551, under H. faustus). In T. sinuata the orifices were 
contracted and their character could not be precisely determined. 
2.—TRITONIELLA BELLI (Fics. A* anp B). 
THE collection contains five specimens of this form, which present considerable 
differences in shape and in the greater or less development of the mantle margin and 
the processes which it bears. Mr. Hodgson, however, informs me that they all 
appeared to him to be the same species when captured, and were all milk-white. This 
and the identity of the internal anatomy cause me to describe them as one species and 
not to distinguish even varieties, since the diversity of appearance, though considerable, 
is probably due to artificial causes. The animals have no doubt the power of altering 
their shape from flat and broad to high and narrow, and the Tritoniide are very apt to 
have their mantle margin and branchie rubbed off, without. any clear sign of the loss 
remaining. Besides being exposed to ordinary distortion, the present specimens were 
captured in a temperature which caused them to freeze into solid lumps before they 
could be placed in the preserving fluid. 
The specimens may be classified as follows :— 
A. One specimen captured at Hut Point, Winter Quarters, February 13, 1904, 
with the D net. It appears to be very well preserved, and is of a uniform pale yellow. 
Length 50mm., maximum breadth 30, height 19. The broad undulated mantle-edge 
bears a row of papille, and the oral veil is distinctly tuberculate. 
B. Two specimens from McMurdo Bay, 4-10 fathoms, February 13, 1902, and one 
specimen captured with the D net at Winter Quarters, hole No. 12,0n August 24, 1903. 
In all these specimens the edges of the mantle and of the oral veil are much less distinct 
than in A, and there are only a few processes. The measurements are as follows in 
millimetres. 
Length. Breadth. Height. Breadth of foot. 
63 22:°5 13°5 13 
60 16 14°5 11 
44 19°5 19 9 
One of these specimens is represented in Figs. 1 and 2. 
C.—One specimen captured with the D net at Hut Point, Winter Quarters, 
November 19, 1902. Colour, grey; back much arched ; anterior portion, especially 
left rhinophore, greatly swollen. This specimen, which is superficially unlike all the 
others, appears to have suffered considerable distortion, which is confirmed by the fact 
that the viscera have been drawn up into the anterior part of the body cavity, leaving 
the posterior half empty. 
* The letters refer to figures on the plate; the text figures are distinguished by. cyphers. 
