226 TRANSACTIONS OF THE WAGNER FREE 



Marginella onchidella n. s. 

 Plate 13, figure 7. 



Pliocene of the Caloosahatchie and Shell Creek, Dall and Willcox. 



Shell related to M. rostrata Redfield, from which it differs by its more 

 ovate-cylindrical form, wider aperture, less angular periphery, and particularly 

 by a peculiar lump of callus on the middle of the enamel of the body, looking 

 as if a drop of enamel had been allowed to fall there and become partially 

 diffused at the edges before hardening. The average specimen is considerably 

 larger than the specimens of rostrata I have been able to use for comparison. 

 A being the most perfect specimen selected for figuring, but undersized, B 

 will indicate one of the larger ones. Lon. of shell A, 15.0; B, 19.3; max. 

 lat. of shell A, 9.0; B, 11.5 mm. 



The whole shell is thin, clean-cut and elegant. 



Marginella (Volutella) dacria n. s. 

 Plate 14, figure 5. 



Pliocene of North and South Carolina, in the Waccamaw and Croatan 

 beds, Johnson. 



Shell small, cyprseiform, callous, ovate-pyriform ; aperture as long as the 

 shell, rather wide, rounded at the ends; inner lip with four plaits, larger ante- 

 riorly; outer lip denticulate on its inner edge, the denticles rather more 

 prominent on the anterior half; base of the shell enclosed in a halo of callus, 

 which in old specimens marginates the shell much as in such a Cyprcea as 

 C. a7tnuliis. Surface enamelled, the spire hidden, the enamel smooth and 

 polished. Max. lon. of shell 5.0; lat. of same 3.3; alt. of back when the shell 

 lies on its aperture 2.3 mm. 



This is the largest and most characteristic of our East American species 

 of Volutella, and easily distinguished by its flattened form when mature. Like 

 all the species, it varies somewhat in size, and is more globular when the 

 enamel has not been deposited. It was obtained by Mr. Johnson from the 

 Waccamaw and Croatan beds, and also from the Cape Fear River marls. 

 The measurements given are of an average specimen. 



Mr. Harris, of the U. S. Geological Survey, has collected a large, very 

 globose specimen of Volutella at Plum Point, Maryland, in the older Miocene. 

 It appears to be different from any of the described species. 



Family VOLUTID^E (supplementary). 



Genus SCAPHELLA Swainson. 



Subgenus Scaphella s. s. 



Scaphella Trenholmii Tuomey and Holmes. 



Part i. p. S8 ; T. & H., PI. Fos. S. C, p. 128, pi. 27, figs. 7, 8. 



A fine series of this Species has been obtained by Messrs. Willcox and 

 Johnson from the Miocene of the vicinity of the Natural Well, Duplin 

 Co., N. C. 



