135 St. Maurick and CIvAiborne Pelecypoda 135 



Horizon, specimen figured, locality. — St. Maurice, La. (At 

 the mouthof Saline Bayou.) 



An imprint in ferruginous matter from Bayou Negreet 

 seems to be referable to this species. 



Meiocardia caroMnse Harris, PI. 42. Fig. 11. 



M. carolince. These Bulletins, No. 33, Mar., 1919, p. 14, pi. 2, figs. 

 5, 6. 



For original description see the above reference. 



Type. — Paleont. Mus. Cornell Univ. 



Horizon.— ^t. Maurice and Jackson. 



Specimen figured. — 17 miles above Newburn, Neuse River, 

 N. C. 



The imprints of the exterior of specimens from this localit)^ 

 show the finer markings and even the posterior radiating ridges 

 better than the Jackson types do. 



A large cast is in our collections marked "Kinston, N. C." 



Meretrix {sen. lat. of Fischer) 

 Perovata stock 



This stock is well differentiated in the upper Sabine at 

 Woods Bluff, Ala., in a form heretofore referred to perovata or 

 subimpressa (with, a query), but which deserves to be given a 

 a designation of specific rank. See sylv^sriipis below. The ma- 

 jority of the members of this stock were smooth and polished ex- 

 teriorly. Where concentric markings occur they are smooth- 

 topped undulations without sharply incised lines. The pallial 

 sinus is well defined, either deep U-shaped or sub-biangular. As 

 a rule the species are flatfish, but in the typical perovata of the 

 Claiborne sand become greatly developed umbonally. 



Passing upward from the Woods Bluff horizon it may be 

 noted that the subimpressa of the Virginia Basin is more ellipti- 

 cal, thinner, and with a shallower pallial sinus, while the variety 

 lisbonensis at Lisbon, Ala., gradually broadens towards subvitrea 



