106 AMERICAN JOURNAL 



TELLINID^ ? 



CUMINGIA MEDiALis, Conrad. 



Description. — Ovate-trigonal ; beaks central ; surface with 

 concentric lamellar lines ; posterior side folded, with the op- 

 posite ventral margin emarginate. 



Gumingia tellinoides, Con. — Miocene Foss., p. 28, pi. 14, fig. 4. 



Locality.— -JsLmes River, Virginia. 



Observations. — This species is much larger than the recent 

 C. tellinoides^ and differs in being proportionablj shorter, in 

 having central beaks, a much larger hinge plate, &c. It is 

 very variable in form, and has the habits of Saxicava. 



RECENT SPECIES. 

 ANATINID^. 



PERIPLOMAjSchum. 



P. FRAGiLis, Totten. 



Description. — " Thin, fragile, white, rounded ovate, inequilate- 

 ral ; the shorter side narrowed and truncated; tooth narrow, 

 directed obliquely forward." — Gould. 



Anatina borealis, Gould (not Say). This species is much 

 more elevated and proportionably shorter than P. papyratia., 

 Say, which is found only on the Southern coast. It is more 

 nearly related to P. alta.^ Conrad, a Miocene fossil of New 

 Jersey, but that species has more prominent beaks and a hinge 

 plate very different in form. As Col. Totten refers to me as 

 having influenced his reference of this species to P. papyratia.^ 

 it is proper to adopt his proposed name, which was suggested 

 by some doubts of its being Say's species. Its close relation 

 to the New Jersey Miocene species is very interesting, because 

 it lives, apparently, no further south than Massachusetts, and 

 the Miocene species is associated with abundance of Crassatella, 

 a dementia, yfhioh genus now inhabits Australia and the Phi- 

 lippine Islands ; Carditamera, which is unknown in a recent 

 state north of Florida; Ecphora, an extinct Miocene genus 

 with two species, one American and one European. 



