303 Bulletin 5 33 



FOSSIL SHELLS. 1 27 



Length one inch and a quarter, breadth rather 

 more than three-fourths of an inch. 



This is shorter than the reticosum of Sowerby, 

 the suture is not so deeply impressed, the undu- 

 lations are not so obvious, and the concavity of 

 the labium is much more profound. 



2. B. arahim. PI. vii. fig. 4- Oblong subovate, 

 spirally striated ; labruni thickened and toothed 

 within. 



Description. Shell with more than twenty re- 

 volving, slightly elevated lines : whorls but little 

 convex : suture very narrow, consisting of a mere 

 indented line : aperture moderate : labium cover- 

 ing the columella, which is concave : labrum thick- 

 ened on the exterior, and with striseform teeth on 

 the interior submargin. 



Breadth half an inch, length of the aperture 

 rather less. 



Smaller and of a much more slender form than 

 the preceding, and altogether destitute of undula- 

 tions. ' The summit of the spire being deficient in 

 the specimen, its length cannot be ascertained. 



FUSUS. 



F. ^-costatiis. PI. vii. fig. 5- Ovate-ventricose ; 

 with a dilated umbilicus, and four much elevated 

 belts, which are more dilated at their tops. 



Description. Spire short, the volutions with but 

 two belts, the others being concealed by the suc- 



[J. A. N. S., Phila., ist Ser., Vol. IV, 1824.] 



