346 TRANSACTIONS OF THE WAGNER FREE 



Adeorbis concavus H. C. Lea. 



Delphinula concava H. C. Lea, Trans. Am. Phil. Soc, 2d Ser. ix. p. 261, pi. 36, fig. 70, 



1845. 

 Delphinula lipara Meyer, Proc. Am. Phil. Soc. xxv. p. 137, not of H. C. Lea. 



Chesapeake Miocene of Petersburg, Va., Lea, and of Duplin Co., N. C, 

 near the Natural Well, Burns ; Newer Miocene of the Cape Fear River at 

 Mrs. Guion's marl-bed, Johnson ; Pliocene of the Caloosahatchie beds, 

 Florida, Ball. 



This species resembles the next, but may be distinguished from it by 

 its more polished and shining surface, flatter spire, greater extent of the aper- 

 ture applied to the body, and slightly more angulate periphery. Meyer unites 

 this species to A. lipara Lea, but they seem to me sufficiently distinct. 



Adeorbis Holmesii Dall. 



Cochliolepis parasiticus Holmes, Post-Pleioc. Fos. S. C, pi. xiv. figs. 9, 9 a, 9 b, i860 ; not 



of Stimpson. 

 Vitrinella Holmesii Dall, Rep. Blake Gastr., pp. 360, 392, 1889. 



Newer Miocene of Duplin County, N. C, Burns; Post-Pliocene of Cain- 

 hoy, Wando River, S. C, Holmes. 



The descriptions of C. parasitica and Adeorbis nautiliformis appear to be 

 mixed, and the numbers of the figures on the plate are reversed. The figures 

 above cited refer to this species. The species differs from the preceding in 

 the absence of polish on the whorl, in being slightly more striated spirally, in 

 having the suture more impressed, the whorl in front of it slightly concave 

 instead of merely flattened, the periphery more rounded, and the aperture 

 applied to the body-whorl only at its posterior angle, and for a shorter dis- 

 tance. I supposed, from the figure alone, that this might be referable to Vitri- 

 nella, but the examination of specimens shows that it is probably an Adeorbis. 



Adeorbis Leai n. s. 



Newer Miocene of Duplin County, N. C, Burns. 



Shell resembling A. concavus Lea, but larger, with a relatively smaller 

 spire, the periphery rounded, the outline of the spire an almost even segment 

 of a circle, not flattened except very slightly in front of and close to the ap- 

 pressed suture. It also differs in being covered all over with very fine, sharp, 

 elevated spiral lines with about equal interspaces, somewhat fainter on the 

 base and stronger again in the umbilicus, which is deep and of about the same 

 relative size as that of ^. concavus, and the obliquity, form and application to 

 the body-whorl of the aperture are very similar to the same features of .^4. 

 concavus. Whorls more than three (nuclear part lost in the specimen). Alt. 

 of shell 3.5 ; max. diam. 8.0 mm. 



This is a very recognizable species, in which the spire is more infolded 

 and the form fuller, larger and more rounded than in A. concavus. The type- 



