33 St. Maurice and Claiborne Pelecypoda 33 



Surface covered by numerous, radiating, dichotonious 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. ]\Ioore, 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- 

 tx at the extreme anterior, somewhat as figured by Deshayes 

 under J/, spatulata (see fig. 7). 



It is quite pos.sible 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 costae, however, than shown in texanus. 



Type. — Phila. Acad. Collection. 



Geological horizon. — St. Maurice Eocene. 



Specimen figured. — From near Red Land, 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 

 S. of Hephzibah, Burke Co., Ga. are probably texanus. 

 Modioiaria alabsmensis Meyer, PI. 17. Fig. 9. 



M. alabaiuieiisis Meyer, Bull, i, Geol. Surv. Ala., 1886, p. 83, pi. 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. ; "Lowest Claibornian." 



The figured type is a young shell. 



We have found nothing like this in our collections and hence 

 quote Meyer verbatim and reproduce his figure. We cannot helj) 

 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- 



