BY THE REV. J. E. TENISON-WOODS. 
1071 
29. Opisthostoma, Crosse and Nevil], Jour, de Conch. XXVII. 
1879, pp. 197, 205, 339. 
Shell with the upper whorls obliquely deflected ; last whorl 
con.stricted, thin, inflated, finally sinistrally ascending close to 
the upper whorls ; aperture reversed, almost vertical, rounded ; 
peristome continuous and duplicated ; operculum normal. Habitat 
the same as the last genus. Scarcely a dozen species. 
Opisthostoma paulucci.®, Crosse and Nevill, Jour, de Conch. 
XXVII, 1879, pp. 197, 205, 339, pi. 8, fig. 1; Godwin-Aust. and 
G. Nev. Proc. Zool. Soc. 1879, p. 738, j)l. 9, figs. 2, 2a, 26 ; von 
Moll. Jour. As. Soc. Beng. LV. 1886, p. 313. 
Bukit Pondok. 
0. PERAKENSE, Godwin- Aust. and G. Nev. l.c. p. 738, pi. 60, 
figs. 1, la, 16 ; von Moll. l.c. p. 313. 
Bukit Pondok. 
O. CRESPiGNYi (Plectostoma), H. Adams (Coll. 1.) ^ Plectodoina 
I)e Crespignii, H. Adams, Ann. and Mag. Nat. Hist. 3rd ser. 
XV. p. 177 (Pfr. Mon Hel. V. p. Opisthostoma decrepignyi, 
Paetel, Catal. p. 119= 0. crespignyi, Pfr, Mon. Pneumon. Suppl. 
Hi. p. 68. 
Labuan, Borneo. 
Family PUPININ2E, Pfr. 
30. Purina, Vignard, Ann. Sc. Nat. Vol. XVII I. 1829, p. 440. 
Shell 8ub-cylindric like Pupa, tliiii, transparent, smooth, very 
Khining ; mouth not quite round ; the columella margin with a 
deep notch anteriorly and a tooth posteriorly ; pei istome .simple ; 
operculum in all the family orbicular, thin, homy, with numerous 
gradually increasing whorls from a central nucleus. 
Purina artata, liens.; von Mull. dour. As. Soc. I!eng. LV. 
1880, p. 314. 
Peiak. 
08 
