272 PROCEEDINGS OF THE ACADEMY OF [Feb., 



are not very strongly differentiated, together constituting nearly half 

 the entire length of the shell. The nucleus is as wide as high, consisting 

 of about three whorls, smooth but gradually acquiring the fine riblets 

 which become the eight or nine rather narrow and subacutely elevated 

 oblique ribs of the subsequent whorls, the latter short, about four in 

 number in the largest specimen before me, the ribs angular in profile 

 from base to apex of the whorl, with point of maximum elevation just 

 below the middle of the length and becoming obsolete just below the 

 pronounced uneven and closely duplex collar margining the suture 

 beneath. Each whorl has six or seven coarse, subequal and closely 

 approximate flattened or slightly convex lyrse, those in lower half 

 slightly coarser than the posterior three, and that at the middle slightly 

 thickened at the summits of the ribs. Length of the largest in an 

 extended series 7 mm., width 2. ,5 mm. This species occurs only in the 

 upper marls at Vicksburg and is common. 



PHANDELLA n. gen. 



This genus occurs, in the Upper Vicksburg marls, and appears to 

 have no closely allied living descendant, although related perhaps to 

 Daphnella. The shell is minute, and the animal apparently existed the 

 greater part of its life in the nuclear stage, there being no example 

 which I have seen, out of a considerable series collected, possessing 

 more than ^between one and two body whorls. The nucleus is rela- 

 tively large though evenly conical, pointed, consisting of from five 

 to six whorls which are exquisitely sculptured in two systems of very 

 minute lines crossing each other at an angle of about 45°, producing 

 an appearance very much like the engine-turning frequently engraved 

 upon a watch. 



There are before me three species,, distinguishable among them- 

 selves by very clearly marked characters, but at the present time 

 I will only briefly outline the most abundant of the three, which may 

 be regarded as the type of the genus. 



Phandella nepionica n. sp. 



This species has about one and a half body whorls, which are together 

 about twice as long as the nucleus, polished and completely devoid 

 of revolving sculpture, having, however, about ten sharply elevated 

 longitudinal or slightly oblique ribs, which become abruptly declivous 

 posteriorly and obsolescent near the suture. The nucleus has about 

 five whorls; the canal is rather short and there is a fine raised collar 

 margining the suture beneath, which line may also be observed^ to 



