INSTITUTE OF SCIENCE, PHILADELPHIA. 283 



aperture short, outer lip thickened, with a well-marked sinus at the junction 

 with the body ; subsutural ridge strong, body-callus well marked ; canal short, 

 recurved, pillar with spiral threads outside, within arched, simple ; outer lip 

 grooved near the edge in harmon}- with the sculpture. Lon. of (decollate) 

 shell 24 ; max. diam. 7.5 mm. 



This species is much like C. miiscanini Say, but is readily distinguished 

 by the basal sculpture, and the absence in C. callisovia of the excavation 

 which is so marked a feature of C. vuiscannii. 



Cerithium rauscarum Say. 



C. muscarutii Say, Am. Conch, v. pi. 49, fig. i, 1S32 ; Tryon, Man. ix. p. 132, pi. 23, figs. 



12, 13. 

 C. notaium Menke, Synopsis, p. 33, 1826, ed. ii. p. 58, 1830 (name only). 



Pliocene of the Caloosahatchie, Myakka and Alligator Creek, Florida, 

 Willcox and Dall ; Post-Pliocene of North Creek, Little Sarasota Bay, 

 Florida, Dall ; living on the coasts of Florida from Lake Worth on the east 

 and St. Andrew's Bay on the west south to Cuba and Jamaica. 



This fine species is readily recognizable by its prominent sculpture and 

 deeply excavated base. Menke, who seems to have received specimens 

 labelled " stercus-iniiscanmi Say," a specific name already in use, suggested 

 the name notatmn for the species, but did not describe it, and when Say some 

 years afterward published a description he named it viuscarum. 



Cerithium glaphyrea n. s. 

 Plate 14, figure 4. 



Pliocene of the Caloosahatchie, Dall. 



Shell small, with two or three smooth nuclear and ten subsequent well- 

 rounded whorls ; spiral sculpture of numerous stout, flattened, close-set 

 threads, varying somewhat in size, of which a pair in front of the suture and 

 one near the periphery are nodulous, while the rest are merely wavy or 

 transversely wrinkled, if not simple ; some, though not wider, are more 

 elevated than others ; suture distinct, not appressed or marginate; transverse 

 sculpture of about fifteen small, feeble ribs, which are made evident by the 

 nodulation of the three principal spirals before mentioned where the latter 

 override them, and one or two not prominent varices, of which one will be 

 on the last whorl ; aperture expanded slightly, outer lip thickened and 

 faintly grooved in harmony with the exterior sculpture, a moderate callus and 

 subsutural ridge on the body; pillar simple, short, twisted ; canal short, well 

 marked, recurved ; base rounded, spirally threaded, not excavated. Lon. of 

 figured specimen 16; max. diam. 6 mm. 



