1904.] NATURAL SCIENCES OF PHILADELPHIA. 415 



Bifidaria jamaicensis C. B. Ad. 



The commonest of the recent Pupidse, but I failed to find it fossil. 

 Greater Antilles. 

 Pupoides marginatus Say. 



I got one indubitable specimen from locahty 809, but it went to 

 pieces in my hands. I found only two or three recent ones. Mr. 

 Owen Bryant, who was collecting at the same time, found a larger 

 number. Eastern and Central North America, and some West Indian 

 islands. 

 Carychium bermudense n. sp. PI. XXXVI, figs. 11, 12. 



Shell almost regularly tapering, corneous-white, imperforate, finely 

 striate; whorls about 5, increasing regularly, those of the spire very 

 convex, with deep sutures. Aperture quite obhque, obstructed by a 

 small parietal and a very minute, deeply placed columellar lamella. 

 Peristome broadly expanded and refiexed, thickened within by a white 

 callus, with a sHght groove on its front face, and developed inward 

 to form a prominence slightly above the middle of the outer margin 

 (near the position of the upper palatal fold in Bifidaria). 



Alt. 1.8, diam. .9 mm. 



This species is very dissimilar to the slender Carychium jamaicense. 

 The shape of the aperture allies it more nearly to Carychium exiguum 

 of North America, but its heavy peristome is quite its own. 



It is one of the most abundant fossil species, occurring in the red 

 earth of locaUties 806 and 807, and even in the sand that fills the larger 

 shells in the sand pits. 



Poecilozonites nelsoni (Bid.). 



Ilijalina nelsoni Bid., Ann. Lye. N. H. of N. Y., XI, 1S75, p. 78. 



P. nelsoni Pilsbry, Proc. Acad. Nat. Sci. Phila., 18S8, p. 290. 



P. nelsoni v. Mart., Sitzungsber. Ges. Nat. Freunde, Berlin, 1889, p. .:;U1. 



The typical form of this species is, I suppose, the large, moderately 

 elevated form. This is represented among my specimens from locality 

 814, where the variation in dimensions is as follows: 



Alt. 29 Diam. 39 mm. 



28 37 



27 41 



27 40 



26 35 



25 39 



23.5 36 



23 41.5 

 23 (estimated) 35 



The way these lay, piled together in a little pocket, compels the 

 supposition that they lived at about the same time, and their varia- 



