46 BUI^LETIN 31 46 



examining several specimens it becomes apparent that the fosset 

 is of the Trinacria type, with more area before the beak than be- 

 hind it, and with vertical, NoitiaASk.^ grooving of the bottom. 

 The pit in Limopsis is on the order of the cartilage pit in Pcden, 

 showing, at least in good specimens a horizontal sculpturing on 

 the bottom. There is no "hinge area" as in typical Limopsis. 



All our specimens so far as known have come from the Clai- 

 borne sands at Claiborne, Ala. 



The specimens figured were collected by the writer on var- 

 ious occasions at the 'Bluff" and are in the Museum (Paleontol- 

 ogical) of Cornell University. 



Trinacria (Pachecoa) cainei, n. s. gen. andn. sp., PI. 20. Fig. 3,3. 



Definition of Pachecoa. — Shell small, rather thin, and of the 

 general appearance of Trinacria ovalis^ but differing widely from 

 all other species of the genus b}* having an .-^;r<z-like exterior rib- 

 bing. 



Specific characterization. — Form, size and appearance as 

 shown by the illustrations and explanations ; ribs about 26-28 on 

 the face of the valve, lacking on post-umbonal slope ; lower mar- 

 gin strongly crenulated by the extremities of ribbing ; ribs hav- 

 ing a tendency to become divided b}^ median line and even bifur- 

 cate toward the umbonal slope or posterio-basal margin . 



Type and specimen figtired. — Paleont. Mus. Cornell Univ. 



Localities. — Three miles and six miles W. N. W. of Orange- 

 burg, S. C. Collected by two of our former students, Caine and 

 Pacheco, 1899. 



Glycymeris stamina Conrad. PI, 20. Figs. 4-8. 



Pectunculus staniineusCo-n.., A. J. Sci., 1833, (Jan.), vol. 23, p. 342. 

 P. Broderipii I^ea, Cont. to Geol., Dec. 1883, p. 76, pi. 3, fig. 53. 

 Axincea stamina Con., A. J. Conch., vol. i, '65, p. 12. 

 Pectunculiis Broderipii A^ Greg., Mon. Faun. Ala., '90, p. 193, pi. 24 

 figs. 2-14. 



Conrad's original description. — Shell suborbicular, ventricose ; with 

 distinct radiating and finer intermediate lines, crossed by minute crowded 

 striae ; inner margin serrate. Length one inch and a half. Found with the 

 preceding [at Claiborne.] 



