24 [Feb., 1846. 



Venus. 



Venus cuneimeris. Plate 1, fig. 13. Inequilateral, triangular ; ventricose 

 anteriorly ; flexuous and compressed posteriorly ; posterior side cuneiform ; 

 surface with obtuse concentric ribs, profound on the umbo, and with minute 

 radiating raised lines ; color yellowish, varied with fulvous or brown, some- 

 times in spots, in other specimens with rays ; within purple and white, with 

 a whitish margin. 



Locality. Tampa Bay. 



Nucula. 



Nucula eborea. Plate 1, fig. 4. Ovate-acute, ventricose, with minute, 

 concentric, very regular lines ; surface highly polished, ivory white ; ante- 

 rior side rostrated, pointed, rather longer than the posterior side. 



Locality. Keys of Tampa Bay : rare. 



Modiola. 



Modiolapapyria. Plate 1, fig. 8. Ovate-oblong, extremely thin, pellucid ; 

 ligament margin long, rectilinear ; posterior margin obliquely truncated ; 

 basal margin slightly contracted ; color greenish with browu angular spots. 



Locality. Tampa Bay. 



ASTARTE. 



Astarle flabella. Plate 1, fig. 3. Ovate-triangular, profoundly compressed, 

 and having ten flattened radiating ribs ; posterior basal margin obliquely 

 truncated ; color white, with fulvous spots. 



Locality. Bgmont Key, Tampa Bay. 



This species approaches A. radians, Con., a Miocene fossil, but it is not 

 so fiat, and has fewer, wider, less prominent ribs. 



A. triquclra. Plate 1, fig, 6. Very small, triangular, elevated, equilateral 

 and symmetrical, ventricose, polished, white, sometimes brown or purple on 

 the disk in form of a broad ray. 



Locality. Tampa Bay. 



Osteodesma, Desk. (Ltonsia, Turton.) 

 Osteodosma hyalina ? Plate 1, fig. 1. A variety of the northern species, 

 more elongated than those of the eastern coast. I have some doubts of the 

 specific identity. 



Solecurtus. 



Solecurtus fragilis, var. Plate 1, fig. 10. Oblong, straight, color viola- 

 ceous, rayed with bluish white ; epidermis olive, the rays visible upon it ; 

 interior rib oblique; teeth two in each valve, very unequal in size. 



Locality. Egmont Key, Tampa Bay. 



LUCINA. 



Lucina nassula. Lentiform, equilateral, with concentric lamelliform striae, 

 distant above, approximate towards the base: and with approximate radiating 

 prominent lines ; posterior side compressed towards the margin, and with 



