Feb. 1846.] 26 



one or two of the radiating striae larger than the rest; lunule large, ovate- 

 acute, prominently striated ; inner margin deeply crenulated. 

 Locality. Tampa Bay, Florida. 



Corbcla-. 



Corbula limatula. Plate 1, fig. 2. Subtriangular, inequilateral, polished, 

 concentrically striated, the striae of the lesser valve finer and less distinct 

 than those of the opposite valve ; posterior extremity truncated ; summits 

 prominent ; color whitish, tinged with pale brown on the umbo. 



Locality. Gulf of Mexico. Dredged up on the sounding lead in deep 

 water off the coast of Florida. 



Pollia. 



Pollia tincta. Plate 1, fig. 9. Short, subfusiform ; whorls 7, somewhat 

 channelled or contracted above ; longitudinal ribs large, remote ; revolving 

 lines robust, alternated with fine lines ; lines of growth well defined, be- 

 coming prominent wrinkled lines on the spire ; color greenish-white, varied 

 with large irregular brown or ferruginous spots j aperture half the length 

 of the shell; labrum striated within, margin plicated; labium with a prom- 

 inent fold near the summit, and somewhat corrugated towards the base. 



Locality. Mouth of Manatu river, of Tampa Bay, Florida, inhabiting 

 sand bars. 



P. cancellaria. Plate 1, fig. 12. Fusiform, with longitudinal plicae, and 

 more elevated, distant, undulated, revolving costse, and intermediate fine 

 lines ; whorls longitudinally rugose ; aperture half as long as the shell ; la- 

 brum with distant, acute, prominent lines within : columella distinctly 

 plaited at base : beak recurved ; color cinereous. 



Locality. Ship Island, Gulf of Mexico. 



Murex cellulosa. Short-fusiform, with large, prominent revolving lines or 

 costas, the interstices with transverse wrinkled lines, largest on the varices, 

 and giving the shell a cellular aspect; beak much curved ; color cinereous ; 

 aperture small, obovate, purplish within. 



Locality. Tampa Bay. Inhabits oyster beds. 



M. Tampaensis. Fusiform, with acute varices, and distant revolving cas- 

 tas, about eight in number, from angle of body whorl to base ; spire scalar - 

 iform ; whorls with two revolving ribs on each ; labium with obtuse teeth : 

 color cinereous, with purplish brown. 



Locality. Occurs with the preceding species. 



M. ostrearum. Fusiform, with revolving ribs alternated in size, and with 

 longitudinal wrinkles ; spire elevated, scalariform : base umbilicated : 

 within livid. 



Locality. Occurs with the preceding. 



3 



