INSTITUTE OF SCIENCE, PHILADELPHIA. 115 



Differs from C. innscarum in lacking the basal carination of that 

 species ; from C. femiginevm, apart from differences in the character of 

 the ornamentation, in the form of the outer lip, which is not sub-orbicular. 



Genus POTAMIDES. 

 Sub-genus Pyrazisinus, Heilprin. 



I propose to designate under this name certain shells which combine 

 the general characters of Potamides and Pyrazus, differing from the 

 former in the non-canaliculate character of the aperture, and from the 

 latter in the possession of a deep sinus in the labrum ; the outer lip is 

 effuse, thickened much as Cerithidea and carried completely over to the 

 labium, so as to enclose a round siphonal aperture, as seen in the recent 

 Pyrazus sulcatns. 



Pyrazisinus campanulatns, nov. sp. Fig. 59. 



Shell elevated, rapidly tapering ; whorls of spire about ten, convex, 

 obliquely costated, concentrically striated, appearing generally rugose ; 

 costae nearly obsolete on the body-whorl, which is disfigured by one or 

 more (?) prominent excrescences or knobs ; outer lip effuse, broadly-thick- 

 ened on the border, with a deep, nearly parallel-sided, sinus ; basal border 

 of labrum extending completely over to the columellar surface, enclosing 

 a round siphonal aperture. 



Length, nearly two inches ; width of base, one inch. 



Fartula Americana, nov. sp. Fig. 60. 



Shell ovately-cylindrical, of about seven volutions ; the whorls very 

 convex, longitudinally finely lined, the lines, which are barely visible to 

 the naked eye, somewhat more regular than simple lines of growth, and 

 directed downwards obliquely to the right ; body-whorl nearly two-thirds 

 the length of shell ; aperture narrowly oval, vertical, somewhat less than 

 half the length of shell ; lip reflected. 



Length, .65 inch ; width, .3 inch. 



This shell, as far as I am aware, is the first fossil species of Partula 

 known, and is remarkable as extending the range of the genus to a region 

 removed by one-half the circumference of the globe from its true habitat. 

 In what manner its ultimate distribution was effected can only be a matter 

 of conjecture. The species is closely related to P. grisca. 



Eelicina, sp.? 



Several specimens closely resembling in outline H. substriata of Gray. 



Strophia, sp.? 



One specimen, very like .S. incana of Binney, only a trifle broader ; 

 compared with recent specimens from Florida.- 



