14 PROSOPEAS. 



and thin ; columellar margin much reflexed. Length 25, diam. 

 in the middle 3.5, diam. of the last whorl 4.5 mm. ; length of 

 aperture 5, width 3 mm. Color corneous-yellow (de Morg.). 



Perak: Mt. Tchora, near Ipoh (Kinta), among dead leaves 

 gathered between limestone blocks, one specimen (de Morg.). 



Rhodina perakensis DE MORGAN, Le Naturaliste, iii, 7e 

 annee, May, 1885, p. 68 ; Bull. Soc. Zool. France, x, 1885, p. 

 390, pi. 6, f. 9. 



Genus PROSOPEAS Morch, 1876. 



Prosopeas MORCH, Journ. de Conchyl., 1876, p. 358, for 

 Bulimus roepstorfi and B. achates. 



Shell Stenogyroid, of moderate or large size, imperforate 

 or nearly so, with rather small, semiglobose apex, the first 2 

 whorls typically smooth (but ribbed in the s.-g. Paropeas), 

 later whorls very densely sculptured with fine oblique strice 

 which are arched forward above and retracted to the suture. 

 Aperture ovate, columella straight or concave, continuous 

 with the basal margin below, slightly or not folded above, 

 with a reflexed, adnate margin. Axis slender, straight or 

 nearly so. Reproduction by globular, calcareous-shelled eggs, 

 as in Opeas. Type P. roepstorfi. 



Distribution, East Indies, Philippines, north to China. 



The species are illustrated on plates 3, 4, 5. 



Prosopeas as at present limited contains species of some- 

 what diverse structure, falling into three subsidiary groups : 



1. Prosopeas s. str. First two whorls smooth, forming a 

 rounded apex (pi. 4, fig. 8). P. roepstorfi, P. tchehelense, 

 etc. 



2. Section Paropeas Pils., n. s.-g. First two or two and a 

 half whorls vertically ribbed (pi. 3, fig. 88), apex rounded; 

 shell thin. P. acutissimum (type of the subgenus), holoseri- 

 cum, paioense, argent eum, lombockense, etc. 



3. Group of P. haughtoni. Large and solid, the apex 

 rather conic, apparently ribbed, but worn in all the specimens 

 seen. P. haughtoni, P. pealei, and perhaps P. cochliodes and 

 the other large Philippean species, and P. carolinum. 



