144 Trans. Acad. Set. of St. Louis. 



growth formed by the large anal sinus. Below the periphery 

 the sculpture consists of coarse and close-set beaded lines, the 

 one marking the posterior limit of the aperture larger and 

 more conspicuous than the others. The beak is slender, with- 

 out trace of the external;oblique ridge of Cochlespiropsis, the 

 columella straight or broadly and feebly arcuate and the aper- 

 ture and canal combined are generally as long as the remainder 

 of the shell or nearly so. The type is O. cristata Con., of 

 the Vicksburg Oligocene, and the other species known to me as 

 forming typical members of the genus are hella Con. and 

 columbaria Aid., of the American Eocene, and terehralis 

 Lamk. , of the European Eocene. I have not seen the living spe- 

 cies, elegans andradiata, of Dall, upon which he founded An- 

 cistrosyrinx, and my previous statement as to the identity of 

 the latter genus with Cochlespira rests upon the published 

 opinion of Cossmann. If true, Cochlespira, Pleuroliria^ 

 Gemmula and Orthosurcula would be the only Eocene genera 

 known to me as surviving to the present time. It is probable 

 that the species described by Harris under the name Drillia 

 dipta, will constitute the type of a distinct genus near Coch- 

 lespira. The various minute species of Cochlespirella Csy. 

 (Proc. Acad. Nat. Sci., Phila., 1903, p. 279) are left for future 

 consideration. 



Protosurciila n. gen. 



In this genus and Eosurcida there is no trace of ribbing, 

 and the moderately large species composing them may be 

 considered allied more closely to the Gochlespira group than 

 any other; the embryo in both is conical or conoidal and 

 multispiral, and, in Protosurcula is generally very large and 

 with conspicuous longitudinal riblets on the lower whorls. 

 The collar below the suture is cnrinif orm and the long f asciolar 

 surface between it and the obtuse periphery is broadly con- 

 cave and with fine spiral lines ; below the periphery the spiral 

 lyrae are rather coarse. The columella is straight and gen- 

 erally simple, though sometimes having a strong plica above 

 the middle. The spire tapers evenly to the apex and the 

 beak is slender and frequently very long, the aperture and 

 long straight canal combined being much longer than the 



