100 
tekrestkial mollusca inhabiting society islands. 
S. oosTATA, Pease. 
llydrocena costala, Pease, MS. Coll. Pease, 1863. 
Jlydrocena Taheilenais, Carpenter (not of Pease), Proc. Zool. Soe., 1864, p. 676. 
Realia (Scalinella) costata, Pease, Amer. Jour. Conch., 1867, p. 216. 
Scalinella costata, Pease, Jour, de Conch., 1869, p. 158, PI. VII, fig. 2. Schmeltz, Cat. Mus. 
Godetf., V, p. 102. 
Realia costata, Pfeiffer, Mon. Hel., iv, p. 216. 
Very immeroiis on tlie ground in the lowland forests of lahaa, where it is 
peculiar. It differs from Taheifensis in its larger size, more robust form, more turgid 
body, and the ribs are more numerous. 
S. Mousso.vi, O. Semper. Plate III, fig. 71. 
Taheitia Moussoni, O. Semper,” Schmeltz, Cat. Mus. Godeff., v, p. 102. Pfeiffer, Mon. 
Pnenm., iv, p. 21 (name only). 
Not uncommon, and confined to the small island of Maupiti, where they occur on 
file ground in forests. 
'I'lio al)ore name appears without description. I describe it as follows : — 
Shell rimate, rather slender, elongate conical, rather thick, cinereous, beneath a 
brownish or olivaceous epidermis; aperture rarely yellowish ; spire elongate, obtuse, 
with subplanulate outlines ; whorls six and a half, strongly convex, apical ones smooth, 
the others with crowded, longitudinal ribs, about thirty on the rounded hody-whorl ; 
aper'ure roundly ovate, vertical, nearly a third the length of the shell ; peristome 
continuous, somewhat patulous, adhering to the penultimate whorl. 
Length 5, diam. 2 mill. 
More .slender and smaller than Taheifensis, riblets more crowded and more 
numerous, body smaller and the aperture generally more oval. 
Cl., XjctlUill'liK, 
n. MACGEKt.*, Gray. Plate III, figs. 64, 65, vars. 
fs”"' it’ “• 
30). ra.|ir«r, Mo„. pi„„ , "f J , ) . ” ’’ "• "■ 
.... sC’.;’,?; r:-,e."r™;.rc5: r 
Imslierandls “e 
me ,v'‘e i/:;''”""'*.'"' “““ 
C. L niform lemon-yellow 
d. White, with reddish spire. 
All the above varieties ‘iro c-. j 
amber-color. associated with the type. Operculum pale 
