158 MOLLUSCA. 
Suetn nearly hemispherical, a little oblique, not very solid, of a 
dark rusty-brown colour, and often faintly chequered with small, 
dusky spots, arranged somewhat in quincunx. ‘The surface is sculp- 
tured with coarse, sharp, well-raised, longitudinal folds, having a ten- 
dency to overlay each other, and in addition to these may be seen the 
strie of growth. The spire produces a small, slightly raised tubercle, 
which is wholly enveloped in the last whorl; suture ragged. Aper- 
ture small, semicircular, the outer lip strengthened within by an 
orange-coloured callus; throat bluish; the inner lip presents a broad, 
flat surface, as large as the aperture, of a cinnabar-red ; the columellar 
edge is sharp, slightly arched, its whole length slightly denticulated. 
Diameter half an inch; axis seven-tenths of an inch. 
Probably from the Samoa Islands. 
Like N. Bruguiert and canalis, it has the spire wholly involved in 
the last whorl. The former has a somewhat elevated spire, a larger 
aperture, and a smooth and silky, instead of a ridged surface. The 
latter is distinct by the canal which winds along the suture. 
Figures 191, 191 a, two views of the shell. 
NERITINA CHRYSOCOLLA (Gould). 
Testa solida, oblique conico-globosa, coracina, lineis exthbus obliquis fla- 
vtdis flexuosis picta: spira elevata, erosa; anfractibus duobus vel 
tribus ventricosis, infra suturam aliquid constrictis : apertura oblique 
semi-elliptica ; labro ceruleo, viridi-limbato; labio convexo, luteo- 
virente ; columella sinuata, denticulatad: operculum osseum, salmona- 
ceum, costa bisectum. 
Neritina chrysocolla, Goud; Proceed. Boston Soc. Nat. Hist., i. 
237. July 1847. Expedition Shells, 48. 
SHELL obliquely conic globose, solid, smooth, greenish-black, painted 
with delicate, oblique, zigzag, yellow lines: spire elevated, eroded 
at tip, but displaying two or three convex whorls, the large one 
sometimes a little constricted near the suture. Aperture obliquely 
