136 University of Texas Bulletin 



from the Eagleford shales near Denison, Texas and Cragin considers it to 

 be widespread in the Fredericksburg division in South Texas. This species 

 is stated to differ from C. texana (Roemer) in its large thickness and size. 

 Cragin 1 also records Cyprimeria sp. aff. excavata Morton from the Eagle- 

 ford shales ("top of Ostrea quadriplicata beds"). Still a larger Cypri- 

 meria, called C. gigantea* by Cragin is recorded from the Grayson marl 

 near Roanoke, Texas ; we have found similar individuals in the Grayson 

 at Roanoke, Denison, Burleson and elsewhere. Our species appears to be 

 close to Cyprimeria texana (Roemer) which is known as casts from the 

 Fredericksburg division. One individual of this species at hand shows a 

 simple entire pallial line, some details of dentition, and papillae represeting 

 the pits on the inner surface of the valves below the hinge, as mentioned 

 above in the description of C. washitaensis and as figured by Roemer and 

 Conrad for C. texana. The two species seem to differ but slightly, yet in 

 view of the uncertain systematic position of the Fredericksburg species 

 and its poor preservation it is thought best to describe the present material 

 separately. The relations of the pallial line to the posterior adductor 

 muscle scar are entirely different in the two species and the scar is of a 

 different shape. In a fragment of the left valve of a large individual of 

 C. washitaensis from near Denison the scar is subquadrate in shape and 

 the pallial line attaches directly to its lower anterior corner, while in 

 Roemer's figure 3 of the impression of the right valve, the scar is an inclined 

 oval and its postero- ventral end lies in a prominent loop in the pallial line ; 

 this loop is missing in our species. Roemer's species also appears to have 

 a considerably sharper marginal curvature just anterior to the umbo than 

 has C. washitaensis, of which however I have not yet found any interior 

 casts for direct comparison, all of the known material consisting of nac- 

 reous shells. 



REMONDIA ? ACUMINATA (Cragin) 

 PL 6, fig. 1 



This species does not have close similarities in form to that figured 

 by Gabb," yet the hinge is rather similar. Stanton 5 has figured and dis- 

 cussed the species of this genus. The hinge is here figured (PI. 6. fig. 1). 

 The species has an acuminate tip, nearly straight antero-dorsal and postero- 

 dorsal margins and a gently rounded ventral margin. Posteriorly the 



'Cragin, Geol. Surv. Texas, 4th Ann. Report., pp. 176-7, 1893. 



2 Cragin, Ibid., p. 176. 



sRoemer, Kr. Texas, pi. VI, fig. 8a. 



*Gabb, Geol. Surv. Calif., Pal. II, p. 270, pi. 36, figs. 17-17a, 1869 (Remondia furcata). 



5 Stanton, Proc. U. S. N. M., XIX, 299-301, 1920. 



