1903.] NATURAL SCIEXCES OF PHILADELPHIA. 279 



COCHLESPIRELLA n. gen. 

 The Fusus nanus, of Lea, belongs to a genus widely different from 

 Microdrillia, but allied more closely to Cochlespira of Conrad. The 

 genus, which will include also insignifica of Heilprin, which is not the 

 same as nanus according to some very accurate drawings of the types 

 very kindly lent me by Mr. Aldrich, and one or two undescribed Texan 

 forms, may take the above name. 



Couus scopularis n. sp. 



In the Red Bluff deposit there is a Conus, about the size of the 

 Vicksburgian alveatus, but with a much more depressed spire and 

 differing also in sculpture to a marked degree. This species 

 differs also from any of the forms found in the Jacksonian. It is 

 rather broadly obconic in form, the exterior outhne of the body 

 whorl straight, becoming very broadly, feebly arcuate toward the 

 shoulder, just below which there are some two or three close-set and 

 very obsolete obliquely rugulose revolving striae. The anterior 

 oblique revolving striae are very feeble, subobsolete and occupy lower 

 third of the whorl. The oblique anterior columellar fold is feeble. 

 Spire extremely short and flattened, not more than an eighth or ninth 

 as long as the body whorl, the whorls flat, each with five strong revolv- 

 ing lyrae separated by equally large grooves, the arcuate lines of growth 

 very distinct, producing a beaded or scabrous appearance. Length 

 28 mm., width 16.5 mm. The fine striae on the face of the body whorl 

 at the top and parallel to the acute shoulder angle distinguish this spe- 

 cies at once from any in the adjacent horizons. 



The species named Bursa mississippiensis by Conrad, in the list of 

 1865, is, in all probability, the young of Triton conradianus Aid., of 

 the Red Bluff horizon. I have found this species in the Lower Vicks- 

 burg. Bursa abbreviata is, however, a distinct species, moderately 

 abundant in the upper marl at Vicksburg, to which it is confined, as 

 is also Distorsio crassidens. Tritonopsis suhalveata, of Conrad, is 

 confined to the Lower Vicksburgian, like Bursa mississippiensis. 



Phos macilentus n. sp. 



Phos mississippiensis, of Conrad, occurs in both horizons at Vicks- 

 burg, but does not occur at Red Bluff. The species of the Red Bluff 

 formation, which has hitherto been confounded wdth it, may take 

 the name indicated. It is much narrower and more elongate than 

 mississippiensis. The ribs are more numerous, finer and not so nodu- 

 lose at the points where they are crossed by the revolving sculpture. 

 The revolving lines are subequal among themselves, finer than in mis- 



