28 Bulletin 31 38 



Pecten scintiilatus var. corneoides, n. var., Pi. 15. Figs. 15, 16. 



Pseiidaniusiuni daibornense Har., partiiii, Bull. Am. Pal., vol. 2, p. 

 235, pi. 13, fig. I. 



P. calvatus Dall (non Mort), /><? ;-///;/, Tran,s. Wag., Ill, 98, p. 752. 

 P. scintillatns HaW, parti III , id., p. 752. 



Specific characterization . — Form and .size as indicated by the 

 figures (see also fig. in Bull. Am. Pal. referred to in the .sjaiony- 

 my) ; substance of the shell thicker when adult than in scintiilatus 

 of the Jacksonian ; appearance like that of corneus of England, 

 though smaller ; surface practically without markings save the 

 fine concentric lines of growth and a few radiating rays on the 

 anterior ear, such ra3's when adult, separated by a rather broad, 

 smooth space from the anterior margin of the shell as indicated 

 in fig. 16; posterior ear in adult shell with exterior angle ap- 

 approximating 90° and not so obtuse as in scintiilatus (fig. 14) 

 nor so acute as in calvatus ; 3'oung .shells in Mississippi, St. 

 Maurice stage, approaching close in outline to scintiilatus, but 

 here as elsewhere so far as observed no Camptonectes marking 

 (.so finely shown in scintiilatus^ have been observed ; left valve 

 very flat in umbonal region, becoming deeper centrally and basal- 

 ly, with a faint, medial fold rapidly expanding basall}'. 



Type specimen. — The Hatchetigbee specimen figured in Bull. 

 Am. Pal, as cited above. 



Horizon. — Sabine and St. Maurice. 



Specimens figured. — Deposited in C. U. Mus., St. Maurice. 



Localities. — Three miles E. of Alto, Cherokee Co., near 

 Crockett, Houston Co., Tex. St. Maurice, Winnfield Marble 

 Quarry and Hammett's Branch, La. Hickory and Wantubbee, 

 Miss. Hatchetigbee, and base of bluff at Claiborne, Ala. 



Specimens of this form from Enterprise Miss., in the U.S. 

 Nat. Museum, No. 137,665, are labelled/*, sci^itillatus. 



Amussium squamulum Lamarck ? PI. 15. Figs. 17, 18. 



For synonymy and discussion see Bull. Am. Pal., vol. 2, p. 1897, p. 

 236. 



In the St. Maurice stage as exhibited about the mouth of 

 Negreet Baj^ou, La., there are often many badly pre.served speci- 



