Hutton.—On some Branchiate Mollusca. 165 
Turzo smaracpus. Dentition. The cusps of the teeth are smooth, with 
cutting points. The central tooth and the laterals have one cutting pomt 
each; the marginals have two each, the inner being the larger ; in the first 
three or four marginals these points are very large and acute, in the other 
marginals they are rounded. (Pl. VIL, fig. @.) 
Zizyputnus punctunatus. Dentition, All the teeth have denticulated 
apices without cutting points. The first two or three marginal teeth are 
denticulated on the outside only; the rest, as well as the central tooth and 
the five laterals, on both sides. (P. VIL, fig. n.) 
Anruora Trarata. Dentition. The central tooth is broader than long, 
the cutting point, with five strong denticles on each side, at the base. The 
cutting points of the laterals have four or five denticles on the outside, the 
inside is smooth ; the cutting points increase in length outward. All the 
marginal teeth are small, being well marked off from the laterals; the 
cutting points are small and denticulated on the outside. (Pl. VIL., fig. N.) 
CanTuarmus TexTuratus. Animal. Foot white along the sides, marbled 
with dark purple, which colour forms a transverse band on each side of the 
operculum ; the hinder part is light reddish brown margined with white. 
Head purplish red, with a pale line down the middle. Tentacles long, 
white, fringed. Eye peduncles reddish. Filaments, three on each side, 
white. Side lappets white. 
: Dentition as usual, the central tooth longer than broad. (Pl. VE 
g. 1.) 
I have found what I take for this species occasionally at Lyttelton, but 
always small. It answers well to the description, except that ‘the grooves 
between the ribs are smooth. 
Canruaripus purmius. The dentition resembles that of the last species, 
but the central tooth is slightly broader in proportion. (Pl. VIL, fig. x.) 
: Canruarrpus Hurronn. Animal. Foot white or yellow, thickly marked 
with blue-black, concentric, interrupted, lines. Head black with three 
White triangular marks on the vertex between the tentacles ; rostrum black, 
roadly margined with bright yellow or white, with black, concentric, inter- 
Tupted lines like the foot. Tentacles fringed; white with a black longitu- 
alline. Eye peduncles short, white. Side lappets white, fringed on the 
left side, smooth on the right. Filaments three on each side, like the ten- 
tacles. ‘The animal is very slow in its movements, and varies much in colour. 
Dentition.—The central tooth is as broad as long, and has a minute 
cutting point ; the central lobe is nearly obsolete. The first four laterals 
have a single, large, sharp cutting point, which is denticulated at the inner 
- The fifth lateral has a small cutting point outside the large one. 
(l, VIL, fig. w.) In these respects it is like C, tewturatus, 
