Oct. 1847.] 285 



terstices with fine longitudinal wrinkled lines; spire elevated, acute; beak 

 narrow, straight. Length If. Very rare. 



The specimen figured is more than twice the size of any other specimen 

 found, though it is an abundant species. 



9. Pleurotoma eborides. 

 Turreted ; whorls nine, smooth, flattened above, obscurely nodulous or sub- 

 costate below ; beak short. Length 6-10. 



10. Pleurotoma abundans. 



Turreted: whorls ten, concave above, with a crenulated prominent revolving- 

 line just below the suture ; convex portion of the whorls with prominent, acute, 

 nearly straight ribs and regular revolving lines ; concave portion with minute 

 revolving lines ; beak narrow, slightly produced. Length f. 



It belongs to subgenus Clavatula, Lam. 



11. Pleurotoma rotcedens. 

 Narrow-subfusiform, small, with a profound deeply crenulated carina on the 



body whorl and in the middle of each whorl of the spire ; suture margined 

 with a prominent line below and a minute one above ; large volution with dis- 

 tinct revolving lines and minute longitudinal wrinkles ; beak slightly produced, 

 narrow, straight. Length \. Rare. 



12. Pleurotoma decliva. 



Fusiform, with subangular volutions, with strong prominent revolving lines 

 on the body whorl, alternated in size ; the whorl flattened and oblique above 

 the angle, with four unequal revolving lines ; lower whorls of the spire with 

 three prominent revolving lines on the lower half, and a fine intermediate line ; 

 upper half with three minute revolving lines, and a larger prominent one below 

 and near the suture ; aperture and canal half the length of the shell. Length 1. 



Allied to P. servata, but wants the longitudinal ribs of that species. Rare. 



Phorus humilis. 



Depressed ; volutions five, with comparatively large shells and fragments 

 adhering : body whorl very wide, much depressed ; base flat ; near the peri- 

 phery concave. Width 8-10. Height \. 



I found but one specimen of its shell, which seems to be less elevated than 

 the other species. 



Buccinum Mississippiensis. 



Turreted ; whorls eight, three from the apex smooth and entire ; the others 

 with longitudinal regular distant ribs and intermediate wrinkles ; revolving 

 lines raised, alternated in size : labrum with eleven raised lines within, not 

 extending to the margin ; columella striated. Length 5-10. Common. 



Typhis curvirostratus. 

 Subfusiform ; volutions 8, scalariform, varices or ribs profound ; tubes long ; 

 that near the margin of aperture thick, elongated, beak elongated, spiniform, 

 much curved. Length 1-10. Not uncommon. 



