OF COXCHOLOGY. 141 



about fortj-four in number; but the specimen iigured has 

 not more than thirtj-four, and is of a much broader form. 

 It is nearly allied to 0. stibmissa, Deshayes. 



DOLIOPSIS. 



D. QUINQUECOSTA, nob. — pi. 10, fig. 15. 



Description. — Subglobose, slightly beaked; body whorl 

 ornamented with five distant, acutely angular, revolviug ribs, 

 the inferior rib smallest and approximate ; spire short, whorls 

 angular at the top and flattened ; aperture narrow ; beak 

 sinuous. 



TURRITELLA, Lam. 



T. PERDITA, nob. — pi. 10, fig. 10. 



Description. — Broad at base ; volutions thirteen or fourteen, 

 laterally flattened, and having five prominent revolving lines 

 on each, with an intermediate fine line ; the two inferior volu- 

 tions of the spire slightly projecting near the base; body 

 volution angulated ; base finely striated ; lines on the volu- 

 tions, towards the apex, crenulated. 



MESALIA, Gray. 



M? AREXicoLA, nob. — pi. 10, fig. 11. 



Description. — Volutions thirteen ? convex, penultimate, and 

 two contiguous volutions, each with seven acute, prominent, 

 revolving lines ; the two inferior lines remote, and the third 

 more prominent and distant than the remainder; towards the 

 apex this line is not more prominent than those above it, but 

 the second becomes large and carinates the volutions, giving 

 them an angular appearance ; one, and occasionally two, 

 very fine lines alternate with the others. 



