GASTEROPODA. 157 
tinct lines of growth and traces of revolving lines covered by a thick 
epidermis, which, in old specimens, is a pitchy black, and in young, 
dark chestnut-coloured, when a few delicate, broken, flexuous, dusky 
lines may be seen on the ventral face. Spire eroded, scarcely promi- 
nent, mostly enveloped by the recurrent outer whorl. Aperture large, 
semicircular, a little oblique, slightly channeled posteriorly ; outer lip 
of a pale golden or honey-yellow colour, somewhat livid in the throat ; 
inner lip large, flat, tinged chlorine-green, and in old specimens, 
having a reddish-brown blotch at its outer anterior margin; colu- 
mellar edge white, deeply sinuate, with a large tooth at the upper 
third, and another near its Jower termination, forming three sinuses, 
the middle one distinctly denticulate. Operculum small and thin, 
almost horny, externally slate-coloured, white at the anterior tip, 
divided longitudinally by a furrow; internally marbled with whitish 
and slate-colour. 
Diameter three-fourths of an inch. 
Inhabits the Feejee Islands. Drayton. 
Allied to the dark varieties of M. cornea, but distinct by its involved 
and girded spire, like N. Bruguiert, and also, by its very sinuous and 
strongly-toothed pillar lip. It has a channel towards the spire much 
like NV. canalis, whose colour and marking of the ventral face it also 
resembles. 
Figures 187, 187 a, two views of the shell; 187 4, the operculum. 
NERITINA PoRCATA (Gould). 
Testa obliqua, sub-hemispherica, solidiuscula, fusco-rubricans, maculis 
parvis nigris interdum tessellata, longitudinaliter striata et rugis con- 
spicuts ordinatis sub-imbricatis porcata: spira viz tumida, anfractu 
ultimo penitus involuta ; apertura parva, lunata: labro callo auran- 
tiaco intus munito ; labio plano, lato, sanguineo ; columella arcuatd, 
denticulata. 
Neritina porcata, Goutp; Proceed. Boston Soc. Nat. Hist., ii. 237. 
July 1847. Expedition Shells, 47. 
40 
