HuTTON. — On some Branchiate MoUusca. 165 



Turbo smaragdus. Dentition. The cusps of the teeth are smooth, with 

 cutting points. The central tooth and the laterals have one cutting point 

 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. (PI. VII., fig. g.) 



ZizYPHiNus PUNCTULATUS. 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. VII., fig. h.) 



Anthora tiarata. 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. (PI. VII., fig. n.) 



Cantharidus 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. (PI. VII., 



fig. I.) 



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, 



Cantharidus pupillus. The dentition resembles that of the last species, 

 but the central tooth is slightly broader in proportion. (PI. VII., fig. k.) 



Cantharidus huttonii. 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, 

 broadly margined with bright yellow or white, with black, concentric, inter- 

 rupted lines like the foot. Tentacles fringed ; white with a black longitu- 

 dinal line. 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 

 base. The fifth lateral has a small cutting point outside the large one. 

 (PI. VII,, fig. M.) In these respects it is like C. texturatus. 



