3« Bulletin 31 38 



Limopsis cuneiis Con., Jr. Acad. Nat. Sci., vol. 4, i860, p. 297, pi. 47, 



fig. 17. 

 Trigonoccelix cuneus Q-on., Amer. Jr. Conch, vol. i, '65, p. 12. 

 Limopsis ( Trigonoccelia) cuneus de Greg., Mon. Faun. Eoc. &c., 1890, 



p . 191, pi. 23, fig. 28 b. 

 Trinacria aineus Cossmann, Notes Suppl., 1S93, p. 15. 



Conrad's original description. — Shell cuneiform, broad, posterior end 

 flattened and forming an angle at the umbonial slope. Length, half an 

 inch. This is a very remarkable species very unlike any I have hitherto 

 seen. 



Locality. — Claiborne, Ma.., London clay. 



This is the most cuneate of the American Eocene species of 

 this genus and is closely allied to certain Paris Basin forms. A 

 close study of the beaks and ligamental pits in this and the for- 

 eign representatives is sufficient to prove that we have here sim- 

 ply one extreme in a long series of species, all really closely akin. 

 The shortness of the series of hinge teeth is brought about by 

 the pointed umbones ; the beaks are really opisthogyrate ; the 

 pit is anterior to the beak as developed and is necessarily deep to 

 possess the required volume in such a contracted space ; radii no- 

 ticeable anteriorly and posteriorl3^ 



The sperimens figured are from the Claiborne sand. 



In Bull. I of the Ala. State Geol. Surv. Aldrich has starred 

 this in the Lisbon column (and not the Claiborne) but all speci- 

 mens known -to me are from the 17 ft. "sand" bed. 



7>/^.— Phila. Acad. Coll. 



Spechnens figured. — Paleont. Mus. Cornell Univ. 



Trinacria ledoides Meyer, PI. 18. Figs. 10 a. 



Trigonoccelia ledoides yi^y%r,^Vi\\. A\a..(^&o\. Surv., No. i, 1886, p. 



79, pl, I, fig. 20. 

 Limopsis {Trigonoccelia) ledoides de Greg., ^Mon. Faun. Eoc, Ala., 



1890, p. 191. 

 Trinacria ledoides Dall, Trans. Wag. &c, vol. Ill, p. 604. 

 Trinacria ledoides Cossmann, Ann. de Geol. and Pal., 12th liv., 1893, 



P- 15- 

 Bleyer's original description. — Convex, ovate ; posterior side carin- 

 ated ; hinge narrovi^, divided by a minute pit ; about eight teeth on each 

 side ; more vertical near the pit, more horizontal near the end ; surface with 

 concentric lines of growth crossed by indistinct radiating lines, which are 

 not perceptible on the umbo, beak turned toward the carinated side ; the 



