33 St. Maurice and Ci^aiborne Pelecypoda 33 



Surface covered by numerous, radiating, dichotomous ridges, flattened 

 above, separated by deep depressions and crossed by fine lines of growth. 

 These ribs almost disappear on the anterior umbonal slope for about the 

 marginal half of its width. 



Length from beak to posterior angle, 2 inches. Width at a right angle 

 to the first measurement, .9 in. Depth of valve .4 in. 



From a coarse brown highly fossiliferous Eocene sandstone from 

 Caddo Peak, Texas. My collection, from Dr. Moore, State Geologist of 

 Texas. 



The one thing most characteristic of the specimens we have 

 referred to this species is the presence of a few, very strong cos- 

 tse at the extreme anterior, somewhat as figured by Deshayes 

 under M. spatulata (see fig. 7). 



It is quite possible that some, at least, of the many Modiolus 

 fragments from near Grovetown, Ga., (Bull. 16, p. 6) one of 

 which is herewish figured (fig. 8), should be referred to texanus. 

 Near the margins of the shell there seems to be less dichotomos- 

 ing of the costee, however, than shown in texanus. 



Type. — Phila. Acad. Collection. 



Geological horizon. — St. Maurice Eocene. 



Specimen figured. — From near Red I^and, La ; (U. S. Nat. 

 Mus. Sect. 19, R 12 W ; sp. 23, N. — Harris). 



Localities. — Caddo Peak, 2 miles S. W. of Campbellton, At- 

 ascosa Co., 2 miles E. of Arnold's Ranch, Erie Co., Tex. ; near 

 Red Land, Vivian, and 7 miles N. of Plaindealing, La. 

 Specimens from No. 7724, U. S. Nat. Mus., McBean, 3.7 miles 

 vS. of Hephzibah, Burke Co., Ga. are probably texamis. 

 Moiliolaria alabamensis Meyer, PI. 17. Fig. 9. 



M. alabamiensis Meyer, Bull, i, Geol. Surv. Ala., 1886, p. 83, pl. 3, 

 fig. 19. 



Meyer's original description. — Rhomboidal, thin ; the small anterior 

 and large posterior part with radiating ribs, leaving the middle of the shell 

 and the umbo smooth ; hinge edentulous, anterior hinge-line notched. 



Locality. — Claiborne, Ala. ; "L,owest Claibornian." 



The figured type is a 5'oung shell. 



We have found nothing like this in our collections and hence 

 quote Meyer verbatim and reproduce his figure. We cannot help 

 feeling that this may be the young of M. texanus. Dall, how- 

 ever, refers to it (Trans. Wag. Ill, '98, p. 806) as "a well char- 



