164 POTAMIDES. 



C. lOSTOMA, Pfr. PI. 34, fig. 79. 



Shell strongly longitudinally ribbed and varicose, spirally striate, 

 stride stronger on the base ; chocolate color, with a narrow central 

 white band. Length, 22 mill. 



So. Carolina — West Indies, Belize, 



Narrower and much more rugose than the preceding species. 

 Reeve's figure is not characteristic. This is probably C Lafondi, 

 Mich., and C. Hanleyi, Sowb. (fig. 74), a white variety of it. Many 

 of the figures in d'Orbigny's "Cuba" are so poorly drawn that their 

 recognition is somewhat difficult, yet I think C. Lavalleana, d'Orb. 

 (fig. 77), may be referred here, rather than to C. scalar if onnis. 

 C. cosTATA, Da Costa. PI. 34, figs. 80-82. 



Shell narrowly elongated, with numerous rounded longitudinal 

 ribs, more or less beaded by several spiral riblets, suture Avell- 

 impressed ; chestnut or chocolate color, sometimes white-banded. 



Length, 15 mill. 



West Indies. 



C. ambigua, C.B. Ad. (fig. 81), is a vatiety in which the spiral 

 sculjature is more strongly developed, making the surface roughly 

 nodulous ; other synonyms are C. salmaeida, Morelet (fig. 82), and 

 C. Petitii, Schramm. 

 C. TURRiTA, Stearns. PL 34, fig. 83. 



Rather thin, purplish white to chocolate, often with an inconspic- 

 uous central white line ; Avhorls convex, with thin, numerous 

 whitish longitudinal ribs, ending below the periphery in a spiral 

 thread, no other spiral sculpture, suture deeply grooved. 



Florida. 

 Section Aphanistylus, Fischer, 1884. 



C. Charbonieri, Petit. PI. 34, fig. 96. 



Thin, corneous brown, smooth, with distant rude, low, longitudi- 

 nal plications ; whorls rather flat, with a spiral thread at the suture, 

 forming a carina on the body whorl, base spirally striated. 



Length, 1-75 in. 



Borneo. 



C. unicarinata, Metcalfe, is believed to be identical ; it was the 

 first published, but has not been illustrated. 

 C. Sinensis, Phil. PI. 34, figs. 97, 98. 



Thin, light corneous, smooth, Avith low rounded ribs and subequal 



interspaces, body whorl obtusely angulated at the jDeriphery, base 



smooth ; sometimes a faint chestnut line below the periphery. 



Length, 1*2 in. 



China; Annam. 



