90 



rafinesque's 



Fossil shells. Orthoceratite 1 sp. Gryphites 3sp. Diclisma 3 sp. 

 rroductus 6 sp. Terebratiilite 8 sp. Eiirytes 3 sp. Gonotrema 2 sp. 

 Diclipsites 4 sp. Triinculites 3 sp. Pleureterites 10 sp. &c. 



This last is a fine N. G. quite prolific in sp. it difi'ers from Pro- 



ductus by being inequilateral. Nay it may be the type of a new 



tribe, since one sp. which I have called PI. stellata having a bilobed 



hinge and a quadrifid shell might also, form a peculiar G. Eemiste- 



rias quadrifida. C. S. R. 



[From the Atlantic Journal and Friend of Knowledge. No. IV., page 

 142. Philadelphia, 1832.] 

 [1491 



New Fossil Shells of Pennsylvania, by C. S. Rafinesque. 



Among the 40 N. sp. of Bivalve fossils 

 found this year on Sherman cr. in the 

 Alleghany mts. I select those which are 

 unequilateral as the most curious, and I 

 shall describe 10 of them giving above 

 the figures of 1, ranged under 3 new 

 genera. All are Inequivalve. 



1. N. G. Hemisterias Raf Shell 

 transversal with 2 wings thus unequilate- 

 ral, hinge with 2 teeth and an angular 

 sinus outside at the beak, margin lobed 

 — -~H. quadriloha fig. 1. Four obtuse 



lobes and 3 obtuse sinusses, lateral lobes 

 like wings one much longer, an oblong 

 furrow on each lobe, length half of 

 breadth. 



2. N. G. Telistrophis Raf. Shell 

 unequilateral transversal with one wing on the longest side, hinge 

 without beak, straight with a round impression inside at the apex, 

 margin unlobed — T. Un^sala fig. 1. Shell convex, minute longitudi- 

 nal curved strias, short side rounded, long side with a twisted 

 obtuse wing, length 2-5ths of breadth. — Impression in Petrosilex, 

 one inch, 



3. N. G. Pleureterites R. Shell unequilateral transversal with- 

 out wings, hinge more or less curved simple or with a wrinkle and 

 a beak, margin unlobed. — The name means irregular sides, Telistro- 

 2)his means spotted hinge, and Hemisterias means half starry — 

 8 sp. 



