26 [Feb., 1846. 



MaEGINELLA. 



Marginella succmea. Plate 1, fig. 17. Elevated; labrum sinuous, aperture 

 contracted above, comparatively wide at base ; columella 4-plaited ; color 

 amber; margin of labrum entire. 



Locality. Tampa Bay. Very rare. 



M. albilabris. Short-subovate, of an olive color, with a white, much 

 thickened margin, extending over the base ; labrum straight, denticulate 

 within: columella with one obscure plait at base. 



Locality. Tampa Bay. 



Oliva. 

 Oliva mulica. Plate 2, fig. 34. Common in St. Joseph's Bay, Florida, liv- 

 ing in the tand in shoal water, leaving a trail by which its habitat can 

 readily be discovered. 



Trochus. 



Trochus 2'ampaensis. Plate 2, fig. 35. Conical ; whorls 6 1 , concave ; 

 with revolving, approximate, densely beaded lines, alternated in size ; base 

 flat, striated, lines crenulated by transverse wrinkles ; umbilicus moderate, 

 forming a rather deep canal behind the labium ; color whitish-brown and 

 dark purple, variegated. 



Locality. Tampa Bay. 



Triton lineolatum. Plate 1, fig. 18. Elevated, with brown revolving lines ; 

 spire scalariform, with numerous varices or costaj on the body whorl ; they 

 are generally smaller, and crenulate the revolving lines; labrum with four 

 teeth within. Length | of an luch- 



LocaWy. Tampa Bay. 



Cerithium protextum. Subulate, elongated, with longitudinal curved 

 acute costae, and fine revolving lines; whorls 15, slightly convex; ribs di- 

 vided and somewhat dislocated by an impressed line below the suture ; 

 color purplish-black ; within the same. 



Locality. Tampa Bay ? 



The specimen described is more than three-fourths of an inch long, but 

 the usual size is less than half an inch. 



Bulla. 



Bulla succinea. Plate 1, fig. 5. Cylindrical, very thin, diaphanous, of an 

 auiber color, and marked with crowded, minute, revolving, wrinkled lines ; 

 columella copcave or channelled towards the base ; labrum straight ; sum- 

 mit above the line of the apex. 



Locality. Tampa Bay. 



Crepiddla. 

 Grepidula maculosa. Subovate ; anterior side flattened ; back acutely 



