134 Bulletin 31 134 



fossil ; this confusion doubtless was brought about by Gabb's 

 comparing it with a Vicksburg form. 



The small, and presumably often 3'^oung, specimens of this 

 genus from the St. Maurice beds of the Gulf States are rather 

 hard to identify; but judging by the form, without umbonal 

 ridge as in nicolleti and diversa, and the indications of beading 

 along the sides of, rather than on the top of, the posterior ribs 

 as in nicolleti it is evident we are dealing here rather with the 

 well-defined form to which Dall has given the name harrisi 

 rather than with members of the Jiicolleti stock. But since Gabb's 

 no-vae gainbrina was given so long before Ball's the laws of no- 

 menclature demand that Gabb's shall be used for this form of 

 Protocardia. The name harrisi maj^ perhaps be retained to de- 

 note the rather small, though adult, specimens found in the up- 

 per Sabine beds at Woods Bluff and elsewhere at about the same 

 horizon. 



Type.— Kc2.d. Nat. Sci. Phila. 



Horizon. — Sabine-St. Maurice Eocene. 



Specime7i figured. — Alabama Bluff, Trinity River, Houston 

 Co., Tex. 



St. Maurice localities. — Smithville. Bastrop Co. ; Alabama 

 Bluff, Houston Co. ; K. Jones' well, Hodge headright, Houston 

 Co., Texas. Hammett's Branch, I^a. Lisbon, Ala. 



Protocardia sairivaiis, n. sp., PI. 42. Figs. 7-9. 



Specific characterization. — General aspect as figured ; small 

 (12x11x8 mm.); surface covered with very fine concentric 

 striae, and where slightly decorticated, with fine radii which be- 

 come gradually stronger as the umbonal angle is approached and 

 from there to the posterior margin become prominent. 



The length of the shell (from anterior to posterior) is a lit- 

 tle greater than one might judge from the illustration, as this 

 dimension is somewhat shortened by the fact that the posterior 

 is turned slightly towards the observer. The posterior radii 

 seem to be imbricated by numerous strong growth lines. 



7>/^.— Dep't Pal. Mus. C. U. 



