PROSOPEAS. 17 



In this large, solid species the early whorls are usually 

 worn in adults. I do not know whether they are costulate or 

 not. The columella in adult but not aged shells is narrow 

 and nearly straight, as usual in Prosopeas, but in old shells 

 it becomes very thick inwardly, *and tapers strongly to the 

 base. The aperture is quite oblique. Three specimens from 

 Sibuyan (pi. 5, figs. 26, 27) measure 



Length 42, diam. 10, length aperture 11.5 mm., whorls 

 Length 44.5, diam. 9.5, length aperture 11 mm., whorls 

 Length 37.5, diam. 9.5, length aperture 11.3 mm., whorls 9. 

 Reeve's figure is copied, fig. 25. The varieties mentioned 

 by von Moellendorff have not yet been described. 



3. P. RHODINJEFORME Moellendorff. 



Shell not rimate, slenderly cylindric-fusiform, thin, sub- 

 pellucid, delicately striate-silky, pale straw-colored. Whorls 

 10, rather rapidly increasing, parted by slightly impressed 

 sutures, flattened, the last and penultimate nearly equal in 

 height. Aperture moderately oblique, drop-shaped; peri- 

 stome simple, acute, the right margin strongly arcuate. Colu- 

 mella not truncate, callous, well arched below, strongly twisted 

 above, elevated like a lamella, spirally receding. 



Length 33.5, diam. 6.5 mm. 



Length 28, diam. 7 mm. (Mlldff.). 



Sibuyan (C. Roebelen) ; Tablas. 



Prosopeas rhodince forme MLLDFF., Nachrbl. D. Mai. Ges., 

 xxvi, p. 115, August, 1894. 



4. P. ELONGATULUM (Pfeiffer). PI. 5, figs. 28, 29. 



Shell imperf orate, subulate, rather solid ; under a very thin 

 cuticle it is striate, sometimes obsoletely decussate, white; 

 spire subulate, acute. Whorls 8, flattened, the last nearly 

 one-third the length. Columella slightly receding, callous, 

 flat. Aperture oblong-oval; peristome simple, the right mar- 

 gin somewhat arched forward; coiumellar margin receding, 

 somewhat thickened, appressed. Length 24, diam. 5.66, length 

 of aperture 7, width 3.33 mm. (P/r.). 



Luzon: Calanang (Cuming). Mareh, in the Ternate group 

 of the Moluccas (Martens). 



