84 ON THE NAIADES, 



seven are on the outer lip — the last of these and the first on the colum- 

 ella are the largest. The deep brown of the throat is visible through 

 the shell. In some specimens there is a finely mottled appearance 

 over the lower whorls of the shell. The white line along the suture is 

 placed on the upper part of the whorl. The outline of the shell is 

 remarkably fusiform. 



Cyclostoma striata. Plate XIX. fig. 77. 



Testa depressd, planulatu, mullistriatd, albci, pellucidu, latissime umbilicatd ; 

 anfractibus quaternis ; apice acuminato, rufo; labro acuta; operculo corneo 

 tenuique. 



Shell depressed, flattened, much striate, white, translucent, very widely umbiiicate ; 

 whorls four ; apex red and pointed ; lip sharp ; operculum thin and horny. 



Hab. Peru. Lieutenant Humphreys. 

 Cabinet of the Academy of Natural Sciences of Philadelphia. 

 Diam. -9, Length -5 of an inch. 



Remarks, — This shell was brought by lieutenant Humphreys from 

 South America, and presented, with many other fine specimens, to the 

 Academy. It resembles the C. Jamaicensis (Fer.) ; but is much larger, 

 and has finer striae. The rotundity of the mouth is slightly modified 

 by the junction of the superior part with the columella. 



AcHATiNA Vanuxemensis. Plate XIX. fig. 78. 



Testa fiisi for mi, tenui, pellucidu, longitudinuliter et transversim striata, luted, 

 in anfractum infernitm obsolete albo-maculatd ; suturis granulatis ; canali baseos 

 curve. 



Shell fusiform, thin, pellucid, longitudinally and transversely striate, ochre coloured, 

 with indistinct white spots on the body whorl ; sutures granulate ; channel curved at 

 the base. 



