164 MOLLUSCA. 
Figure 184, shell with the animal, as in crawling; 1844, foot be- 
neath. 
NERITINA RUGINOSA, REcLUuz, in Revue Zool. Soc. Cuv. 1841, p. 310. 
ANIMAL pale gamboge-yellow above, with longitudinal, interrupted 
lines of verdigris-green; head with distinct transverse lines, and a 
marginal range of radiating ones; beneath lemon-yellow tinted 
greenish ; flesh-coloured about the mouth; tentacles dark above, yel- 
lowish beneath, finely annulated. 
The animal of young individuals, which seems to have been given 
as the typical form of the species, is of a lilac hue, quite different from 
the adult, and might be taken for a different species. 
The character given by M. Recluz, a short, narrow, transverse rib 
at the base of the last whorl, ‘‘a laquelle correspond un canal oblique 
situé a la base de ouverture dont la saillie rend celle-ci anguleuse,” is 
rather the exception than the rule, and applies only to quite young 
specimens. Another variety, his var. g. “mutica, ultimo basi non 
costato, apertura basi non canaliculata nec angulata,” is quite as com- 
mon as any other. In some specimens the flexuous folds do not com- 
mence till a late stage of growth, being merely parallel ridges; and 
there is every degree in this till the shell becomes truly granular. The 
aperture is usually of a leaden hue; but in some Feejee specimens the 
aperture, especially its outer margin, is yolk-yellow or greenish. 
The locality given on the authority of M. Janelle is obviously an 
error. It comes from the Samoa and the Feejee Islands, and was col- 
lected in great numbers. 
Figure 185, the young shell, with the animal as in motion; 1854, 
the locomotive disk; 186, head of the animal, and 1864, outline of 
the shell of an adult specimen. 
NERITINA CAFFRA, Gray, in Sowerby’s Conch. Il., £51. Desnayes 
in Lam. An. sans Vert., vill. 586. 
