93 St. Maurice and Claiborne Pklecypoda 93 



Specimens fig2i}cd. — Paleont. Mus. Cornell Univ. 

 A small variety of this species is found at Alabama Bluff, 

 Trinity River and Elm Creek, I^ee Co., Tex. 



Cuna parva Lea, PI. 32. Figs. 18, a-e. 



Astaiie parva Lea, Cont. toGeol., 1833, p. 63, pL 2, fig. 37. 

 CrassatcUitcs {Cuna) parva Dall, /ar/'/w, Trans. Wag. Ill, 1903, p. 

 1480. 



Lea's original description. — Shell triangular, rounded below, acutely 

 angular above, compressed, equilateral, concentrically and closely striate ; 

 beaks elevated, pointed ; lunule large, lanceolate ; cardinal teeth small, the 

 posterior margin furnished with a long straight lateral one ; cicatrices 

 scarcely visible ; margin crenulate. 



Diam Length .i. Breadth .1 of an inch. 



The species above described is more elevated and more acutely an- 

 gular at the beaks than the others. Its strise are much finer, and it is sup- 

 posed to be emarginate immediately under the point of the beaks. 



The type of the left valve of a species is in the Museum of 

 the Phila. Academy of Natural Sciences, Lea Memorial Coll. No. 

 5223. The right seems to be lost. 



Our figures are of specimens from the Claiborne sand at 

 Claiborne, Ala. Paleont. Mus. Cornell Univ. 



Cuna var. subparva Meyer, PI. 32. Fig. 19. 



Astarte (Microineris) subparva Mr., Special Excerpt, Senckenberg. 

 Natur. Gesellsch. in Frankfurt a. M., 1887, p. 11, pi. 2, fig. 5. 



Regarded by Dall and Cossmann as var. oi parva. 



lUerer's original description (translated). — Small, pointed-triangular. 

 Scarcely convex but not compressed. Left valve with a triangular cardinal 

 and a margin-like posterior lateral tooth. The cardinal teeth of the right 

 valve are divergent, unequal, the anterior weakly developed. Muscular im- 

 pressions oval. Pallial line entire. Exterior surface with strong concen- 

 tric ribbing. Lunule large, smooth, tongue-shaped. Inner margin dentate. 

 Claiborne, Ala. 



In form, size and dentition of the margin the species resembles Micro- 

 ineris )ninutissi)na Lea, which, however, is distinguishable at first glance 

 by its radial ribbing. The species is similar to IMicromeris minor as re- 

 gards its concentric ribbing ; however. iM. subparva is smaller, narrower, 

 more convex, and has a dentate margin. iMicroniens parva ^ occurring like- 

 wise at Claiborne with the two species just mentioned, is certainly gener- 

 ally quite diflFerent in appearance, on an average rather broader, flatter and 

 larger ; yet these relations vary so that they form no sharply defined dis- 

 tinction. However, according to my material, the ribbing is so marked and 



