117 St. Maurice and Ci.aibornb PEiyECYPODA 117 



description it belongs under papyracea. There is but one word 

 in Conrad's description out of harmony with this interpretation, 

 — the word ventricose. Otherwise Conrad's description fits 

 papyracea very much better than any form of the poniilia group. 

 The young of the latter are possessed of strong, not ' 'minute' ' 

 concentric lines ; the ligamental margin is arched, not ' 'straight 

 and oblique" &c., &c. 



Idea's expression, "lunule cordate" is very happily modified 

 in his Observations when he says that the species is "without the 

 deep depression before the beaks' ' . 



The extended lunular area, the somewhat shallow character 

 of the valves, their thinness, with fine exterior sculpturing not 

 decidedly inclined to billowy concentration serve to make this a 

 fairly distinct and well-defined species. It is doubtless of the 

 uhleri^-iihichi stock. 



Type. — There are no specimens in the Lea Collection at the 

 Phila. Academy corresponding exactly to lyca's figures. Perhaps 

 No. 5164 may be the specimen he figured for the left valve 

 though it is but 6-7ths the size of his figure. 



Horizon. — Claiborne Eocene. 



Specimens figured. — Paleont. Mus. Cornell Univ. ; Clai- 

 borne, Ala. 



Lucina bisculpta Meyer, PL 38. Figs. 22, 23. 



L. bisculpta Mr., Bull, i, Ala. Geol. Surv., No. 2, 1886, p. 81, pi. i, 

 figs. 30. 30, a. 



*In our Bulletin dealing with the Bivalves of the Sabine Stage (vol. 

 II, p. 263, pi. 20, figs. 6, 5, a, 6) we hesitatingly referred the Woods Bluff 

 form to Clark's uhleri (by a slip spelling the name tilrichi). Since that 

 date Clark has given much more satisfactory figures of his uhleri and we 

 have obtained specimens for direct comparison and now find the Alabama 

 and Virginia forms close, yet differing by the generally greater size of ul- 

 richi, its longer, more elliptical form, less elevated beaks and lack of a 

 most pronounced, long, oblique truncation posteriorly. Since ulrichi has 

 gotten into the literature we will retain it for the present for the Alabama 

 Sabine form of this stock. 



