Ill St. Maurice anij Claiborne Pelecypoda 



nearly equilateral, very slightly arcuate, moderately inflated ; beaks low, 

 dorsal margin thin, evenly arcuate, passing distally into the rounded ends, 

 of which the anterior is shorter and less high; base slightly arcuated ; in the 

 left valve the posterior dorsal margin above the scar of the internal liga- 

 ment is somewhat reflected, the single minute cardinal is under the beak 

 with a slight fold extending forward. Long. 1.7, alt. 1.2, diam i.o mm. 



A single small shell was obtained from Claiborne shell sand. 

 Though doubtless immature, it is described as being the only representative 

 of the genus in this horizon, JM. dalH Cossman being, under the present ar- 

 rangement, referred to Boniia. 



Lucina dolabra Conrad, PI. 37- Figs. 17-21. 



L. dolabra Con., Am. Jr. Sci., vol. 23, 1833, p. 343. 

 Astarte recurva Lea, Cont. to Geol., 1833, p. 61, pi. 2, fig. 34. 

 Lucina recurva de Greg., Mon. Faun. Eoc. Ala., 1890, p. 202, pi. 27, 

 figs. 36-41. 



Conrad's original description. — Shell elevated, with distant con- 

 centric imbricated and obscure radiating strise ; posterior margin profoundly 

 channelled, beaks prominent and curved forwards ; lunule impressed, cor- 

 date ; inner margin crenulated. Length, half an inch. 



Locality. — Claiborne, Alab., London clay. 



Type. — The half dozen or more specimens of this species in 

 the Conradian Collection in the«Phila. Academy are probably the 

 types Conrad used in describing the species. 



Horizon and locality. — So far as our collections go this spe- 

 cies seems to be confined to the Claiborne sand bed at Claiborne, 

 Ala. 



Lucina arnica de Gregorio, PI. 37- Figs. 22, 23. 



L. arnica de Greg., Mon. Faun. Eoc. Ala., 1890, p. 204, pl. 28, figs. 1-2. 



De Gregorio' s original description . — Testa parvula, solida, insequi- 

 latera, elliptica-suborbicularis antice et postice extus vix subangulata ; 1am- 

 ellis concentricis latis, subimbricatis ornata ; in valva dextra dente cardi- 

 nali potius notato ; dentibus lateralibus (antico et postico) notatis ; mar- 

 gine crenulato. 



Cette espece est analogue par I'ornementation a V Egeria nana Lea. 

 EUe differe de la Z. Smithi Meyer par le defaut de lignes rayonnantes, et 



