HELCIONISCUS. 151 



transparent, of a uniform brown-blackish, but if held up toward the 

 light, a few rays of a beautiful red become visible. (#/*) 

 Length 23, breadth 19, alt. 9 mill. 



Island of Reunion. 



P. gareoni DH., Moll, de Pile Reunion, p.. 42, t. vi (xxxiii),f. 11, 

 12. 



I have not seen this species, which apparently resembles P. oliva- 

 cea and P. ardosicea ; but those species are truly unicolored, whilst 

 this shows rays when held toward the light. It is probably allied 

 to P. profunda Dh. 



H. DEPSTA Reeve. PI. 20, figs. 45, 4H. 



Shell ovate, thin, rather depressed, raised in the middle, rather 

 compressed at the sides ; apex sharp, anteriorly minutely hooked ; 

 radiately striated, stride raised toward the margin ; reddish-chestnut, 

 sometimes faintly rayed with greenish-yellow. Interior livid horny. 



A nearly smooth reddish-chestnut shell, with a sharp minutely 

 hooked apex. (Rve.) 



Macao and Island of St. Pan?. 



P. depsta REEVE, Conch. Icon., f. 85, 1855. 

 H. SANGUINANS Reeve. PI. 30, figs. 53, 54. 



Shell oblong-ovate, rather convex, apex rather anterior ; decussated 

 with concentric striae and small superficial ridges ; whitish, here and 

 there peculiarly rough, marked with promiscuously flowing blood-red 

 streaks, rough surface red-dotted. Interior semipellucid white, con- 

 spicuously red rayed. 



A fine new species of an oblong-oval form, rather flattish, with the 

 apex situated somewhat anteriorly. It is of a reddish-white ground, 

 painted with promiscuous streaks of red, like blood flowing, and the 

 ground is singularly overlaid here and there with an opaque, rough 

 coating dotted with red. (Rve.) 



Cape Natal, S. A- 



P. sanguinans RVE., Conch. Icon., f. lOa, lOb. Oct., 1854. 

 I have not seen this species. It is not mentioned by Krauss or 

 other writers on the Cape fauna. 



(6.) SPECIES OF UNKNOWN HABITAT. 

 H. MELANOSTOMUS Pilsbrv. PI. 32, figs. 67, 68, 69. 



Shell solid, erectly elevated-conical, the base ovate ; slopes nearly 

 straight; apex subcentral, erect. Surface sculptured with numer- 



