162 MOLLUSCA. 
that represented by Souleyet. He gives only the upper view of the 
animal, and we have here the lower view. 
Figure 181, the animal seen from beneath. 
NeritinA Lamarck (Desuaves), in Lam. An. sans Vert., viii. 
578. ReEvE; Conch. Syst., pl. 200, f. 17. Neritina auriculata, 
SowerBy; Conch. Illustr., f. 17. 
ANIMAL small compared with the shell; mantle greenish, mottled 
with dark bluish-green, and tessellated at the margin with a series of 
small spots; head small, cream-coloured, mottled with minute bluish- 
green spots, beneath sky-blue; lips cream-coloured ; tentacles slaty- 
blue, long and slender, not annulated ; eye pedicles of the same colour, 
pale at the eyes; mantle greenish, mottled with dark bluish-green. 
The shells of the two last species, the one from the Society Islands 
and the other from the Sandwich Islands, are scarcely to be distin- 
guished, while the animals inhabiting them are evidently quite diffe- 
rent. 
The only noticeable differences in the shells are, that the former is 
smaller, the auricles less developed, the form more convex, and the 
interior colour is nearly white, instead of the drab or pale olive of the 
Sandwich Island species. 
Figure 180, the foot of the animal. 
Neritina Nurraui (Recivz), Revue Zool. Soc. Cuv., 1840, p. 276. 
ANIMAL with the foot very small, pale olivaceous; head the same, 
broader than the foot, crescentic; lip yellow. Mantle with an undu- 
late margin, dark slaty-blue, with transverse yellow lines or furrows 
at the margin, giving it a-convoluted appearance. Tentacles very 
short, scarcely longer than the head, pale beneath; eye pedicles very 
short and stout. 
This appears to be the same shell as that figured in the Voyage de la 
