1903.] NATURAL SCIENCES OF PHILADELPHIA. 275 



whorls has a broad, moderately elevated double collar subjacent to 

 the suture and a strongly elevated, obtuse and nodose double carina 

 at a third of the length from the anterior margin, the deeply concave 

 intermediate surface having a single strongly beaded line along the 

 middle and a few other very faint and obscurely irregular revolving 

 threads. The lower margin is moderately elevated, the surface thence 

 to the large double carina concave. The spire before me consists of 

 seven body whorls and is 10 mm. in length and about 3.5 mm. in width 

 at base. The remainder of the shell is missing, it being very rare and 

 represented thus far only by fragments. 



The genus Scobinella, of Conrad, is probably vaUd, but contains 

 species having anywhere from two to six or seven columellar folds.^ 

 They hold together very well in general type of sculpture and depart 

 materially in a great many characters from Cordieria. The genus 

 Cordieria does not occur in the American Eocene fauna and there is 

 considerable confusion in the literature concerning it. Cossmann 

 states that the first two of the species originally placed in Cordieria 

 by Rouault are really Borsonia, and, assuming the third species as 

 the type, gives an illustration of a "plesiotype" which would bear 

 considerable resemblance to Latirus were it not for the obsolete canal. 

 He also states that the embryo of Cordieria is paucispiral with subglo- 

 bular apex, which does not agree with our species, such as hiconica, 

 plicata and ludoviciana, and another genus may have to be made for 

 these. In Scobinella the sinus is well developed, but in Cordieria 

 and the American analogues named above it is very feeble, so that 

 on this ground as well as many others the association of Cordieria 

 and Scobinella by Tryon was entirely unjustifiable. In fact the 

 Pleurotomid affinities of some of the forms assigned to Cordieria 

 stand in. need of fuller confirmation. Turbinella perexilis, of Conrad, 

 is a species having two strong columellar folds and is of uncertain 

 relationship. We do not appear to have the true Borsonia in 

 the American fauna, and Borsonia plenta, of Harris (Proc. Acad. 

 Nat. Sci. Phila., 1895, p. 63), cannot properly be referred to 

 that genus. Besides the species from Red Bluff and Vicksburg, 

 referred above to Scobinella, this genus will include PL (Eucheilodon) 

 reticulatoides Harris (I.e., p. 63), from the Lower Claiborne of Texas. 

 The genus Eucheilodon, as represented by crenocarinatum of Heilprin, 

 differs from Scobinella in the form of the nucleus, this being very large, 

 probably indicating a slightly different line of descent. 



^ If Pleurotoma (Moniliopsis) elaborata Con., be included, as I believe to be 

 proper, the genus will have also species without columellar folds as is the case 

 with the genus Microdrillia to be described below. 



