96 MOLLUSCA. 
in faint revolving stripes on the last whorls. Whorls four, nearly flat, 
forming a low, acute spire, the last one enlarging very rapidly, and 
obtusely angular at periphery. Suture distinct, delicate. Aperture 
rather broader than high, semi-elliptical, lip sharp, simple, or a little 
everted. The columella projects, and from its point a callus sweeps 
off, covering most of the base of the shell. Operculum calcareous, 
bright beryl-green. 
Breadth half an inch; axis three-eighths of an inch. 
Found at the Feejee Islands. 
Remarkable for its peculiar green tint, and the rapidly-enlarging 
exterior whorl, so that the two diameters are very unequal. It is 
rather large in size, and resembles H. similis, Sowb., in form. 
Figure 111, shell, with the animal ; 111 a, base of the shell. 
HELICcINA PALLIDA (Gould). 
Testa lenticularis, solhdiuscula, luteo-cinerea, inequaliter striata, epider- 
mide tenuissima induta: spira depressa ; anfractibus quinque acuté 
carinatis, planulatis: apertura semilunaris, ad columellam callosa ; 
labro modice reflexo. 
Helicina pallida, Goutp; Proceed. Boston Soc. Nat. Hist., 11. 202. 
March 1847. Expedition Shells, 37. 
Set small, lenticular, not solid, about equally convex above and 
below, of a pale, yellowish-ash, or straw colour, lip reddish, surface 
rather dead, and marked with oblique, unequal lines of growth, and a 
few indistinct, elevated, rounded, revolving lines, covered with a very 
delicate, sallow epidermis. Spire depressed, whorls five, flattened, 
and scarcely distinguished by the suture, periphery acutely carinated. 
Aperture crescent-shaped, height and width about equal, lip moderately 
reflexed, but narrowed at base; not angular at carina. Columella 
short, direct, central region covered with callus. 
Axis three-twentieths of an inch; breadth three-tenths of an inch. 
