i ee ol 

TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 95 
Adults are nearly always decorticated. The minute perforation is never carinated, 
but sometimes exhibits a slight marginal pinch. The vertical aperture is whitish or 
pale yellowish brown, and the peristome is slightly expanded. The epidermis in young 
examples is thin, smooth, and the same color as the shell. 
O. TEREBRALIS, Gould. 
Cyclostoma terebralis, Gould, Proc. Bost. Soc. Nat. Hist., 1847, p. 206; Expl. Ex. Shells, p. 
106, fig. 120. Petit, Jour. de Conch., 1850, p. 47. 
Omphalotropis terebralis, Pfeiffer, Proc. Zool. Soc., 1852, p. 151. H.and A. Adams, Gen. 
Mol., ii, p. 300. Pfeiffer, Mon. Pneum., i, p. 307. Pease, Jour. de Conch., 1869, p. 151. 
Paetel, Cat. Conch., p. 124. 
Realia terebralis, Gray, Cat. Phan., p. 219. Pfeiffer, Mon. Pneum,, iv, p. 217. 
Atropis terebralis, Pease, Proc. Zool. Soc., 1871, p. 476. Schmeltz, Cat. Mus. Godeff., v, 
p- 102. - 
Atropis Gouldii, Garr. MS. 
Alropis Dohrniana, Garr. MS. 
I found this species plentiful on the ground in a lowland forest on the coast of 
Moorea, and did not find a single example in any other part of the island. It occurs, 
also, somewhat rarely in three valleys on the northwest side of Tahiti, and more 
abundantly in the mountain forests of Borabora. On the two latter islands it is confined 
to an elevation of about 500 feet above sea-level. 
The presence of this species in Borabora is somewhat remarkable, as it does not 
occur on the three intermediate islands. Examples from the latter island, which I 
have distributed to my correspondents under the name of Dohrniana, differ none from 
Gould’s species, except in having a velvety epidermis. 
The Moorea shell, to which I gave the provisional name of Gouldi, varies from the 
type in its more attenuated form, the whorls less ‘‘ imbricated,” and the angle on the 
-last one nearly obsolete. It was found associated with the typical terebralis, into which 
it gradually merges. 
The color is corneous, grayish olive, rarely luteous under a thin brown or horn- 
colored smooth or velvety epidermis. In the type the whorls have, as Gould states, 
an imbricated appearance, but the character is not constant and is more or less evident 
in several other species inhabiting the group. The last whorl is more or less distinctly 
angulated and the axis is rimate or imperforate. In old examples, which are more or 
less decorticated, the aperture is sometimes ochraceous with a pale lip. The size of 
adults ranges from 45 to 7 mill. The peristome is frequently obscurely duplicated. 
O. sciruna, Gould. 
Cyclostoma scitulum, Gould, Proc. Bost. Soc. Nat. Hist., 1847, p. 206; Expl. Ex. Shells, p. 
108, fig. 123. Petit, Jour. de Conch., 1850, p. 47. 
Omphalotropis? scitula, Pfeiffer, Proc. Zool. Soc., 1852, p. 151; 1854, p. 307; Mon. Pneum., 
i, p. 308. H.and A. Adams, Gen. Moll., ii, p. 300. Pease, Jour de Conch., 1869, p. 155. 
