VASIIM. 7 I 



Domingo, and the West Indies is given :is luibitnt in the '' Con- 

 chylien Cabinet," bnt the species does not occur in the Swift 

 Collection, and I thinlc there is no otlier authority for tliis 

 locality. The 3'oung shell is so covered with nodules and revolv- 

 ing ribs as to be readily mistaken for another species. The 

 revolving sculpture disappears and the nodules become fewer 

 and more prominent Avith advancing age. This and the next 

 species do not fall completely Avithin the generic characters of 

 Turhinella ; the sculpture and nodules indicate a transition to 

 Vasum^ but they have not the elaborate ornamentation of the 

 latter genus — particularly its spinose fasciole. 



T. Fusus, Sowb. PI. 20, fig. 9. 



White, covered with a thick, fibrous epidermis tufted in rows. 



Length, 7 inches. 



Habitat unknoion. 



The tufting occurs upon the distant revolving riblets. It is 

 possible that this is a specimen of T. scolymus, in w'hich the 

 development of the tubercles has been partially arrested. 



(icnus VASUM, Bolten. 



y. MURIATICUM, Born. PI. 20, figs. 10, 11 ; PI. 21, fig. 19. 



White, covered with a rather thick, fibrous brown epidermis ; 

 columella tinged with rose-color. Length, 3"5-5'5 inches. 



West Indies ; Panama; Mazatlan. 



Reeve attempts to distinguish V. caestus, Brpd. (fig. 12), from 

 the Ba}^ of Caraccas, by its having broader furrows, larger 

 tubercles and only four instead of five plaits on the columella, 

 but these characters vary considerably' in the numerous speci- 

 mens before me. The fifth plait is merely an incipient one 

 which sometimes occurs between the normal upper plait and the 

 next one below it. The West Coast specimens which I have 

 examined are all four-plaited, and this corresponds with Carpen- 

 ter's remark upon them in his " Mazatlan Catalogue." I think 

 that T. Crosseana, Souv. (fig. 19), described from a single 

 specimen, the localit}' of which was doubtful, is probably only a 

 worn individual of this species. 



V. RHINOCEROS, Gmeliu. PI. 21, figs. 13, 14. 



Variegated, whitish and chestnut - brown ; columella and 



