62 



PLEUROTOMA ELABORATA. Tab. 17, /. 19. . 



Subulate, profoundly cancellated, or with numerous oblique 

 elliptical nodules caused by the intersection of the striae ; beak 

 short, truncated. 



Locality. Claiborne, Alab. No. 4, first ed. p. 46. 



PLEUROTOMA DEPYGIS. Tab. 17, fig. 20. 



Subulate ; whorls angulated in the middle, with obscure oblique 

 nodules on the angle ; revolving lines minute, more distinct in the 

 middle of the body whorl, which is slightly ventricose ; beak short, 

 straight, truncated. 



Syn. P. LONSDALII, Lea, Con. p. 132, pi. 4, /. 124. 



Locality. Claiborne, Aiab. 



Differs from P. nupera in having a much shorter beak and more 

 elevated spire. No. 4, first ed. p. 46. 



PLEUROTOMA ACUTIROSTRA. Tab. 17, fig. 21. 



Narrow-fusiform, with angular whorls, crenulated on the angle; 

 suture defined by a prominent line ; 3 distant revolving prominent 

 lines on the body whorl and intermediate fine lines ; beak pro- 

 duced, attenuated. 



Locality. Claiborne, Alab. 



PLEUROTOMA GEMMATA. Tab. 17, fig. 22; 



Fusiform ; whorls slightly concave above, with prominent-tu- 

 bercles on the angle ; an obsolete tuberculated carina beneath the 

 suture ; beak produced, rather shorter than the spire. 



Locality, Claiborne, Alab. 



Some other small species of Pleurotoma occur at Claiborne, 

 but they are obscure in their specific characters. One very small 

 species,, however, omitted from the plate, is well characterized, 

 and may be named P. CALLIFERA Fusiform, with distant 

 obtuse costse ; whorls plain above ; suture defined by a prominent 

 line ; labium callous above ; beak very short, truncated . 



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