94 BUI.I.ETIN 31 94 



constant that I have been led to separate the two as closel}- allied species. 

 Froiai Meyer's description and figure this seems to us rather 

 distinct irora parva Lea. Its size and form all}' it close to our 

 JiDibriata, 3'et the exterior markings are totally different. 



Cuna var. fimbriata n. van, PI. 32. Figs. 20, a. 



This variety' as figured is long and rather narrow and shows 

 clearly the fimbriate outgrowth of the concentric lines, and defin- 

 ite traces on the exterior of radii, especiall}- towards the ventral 

 margin. It is from the Claiborne sand. 



Cuna? astartoides, n. sp., PI 32. Fig. 21, a. 



Specific characterization. — Form and size as indicated by the 

 figures and explanations ; appearing at first sight like C. viinor, 

 but more rounded basally, smaller, with less erect umbones and 

 with very strong, but finer concentric striation ; appearance in 

 general also approaching A. triajigidatoides ; dentition somewhat 

 as in C. minor, but posterior cardinal much more strongly devel- 

 oped and erect, suggesting the dentition oi Astarte ; a thickening 

 of the margin behind the posterior cardinal suggesting a third 

 cardinal (left valve) ; resilium obscure, but seemingl}^ above the 

 mid-cardinal ; with long, straight posterior channel and sharp 

 lateral margin (left valve); margin entire, like C. minor. 



Type, etc. — I have only the one valve, type, from the St. 

 Maurice Eocene at Wautubbee, Miss. 



Cuna monroensis Meyer, PI. 32, Figs. 22, 23. 



Astarte monroensis l^leyer. Excerpt from "Senck'bg. , Naturf. Gesell. 

 Frankf. a. M. 1897, p. 10, pi. 2, fig. 6. 



Meyer^s original description (translated). — Small, convex, inequi- 

 laterally triangular ; ventral margin strongly and regularly curved. Right 

 valve with two divergent cardinal teeth and one anterior lateral. The two 

 cardinals of the left valve are very unequal ; the one strong, triangular ; the 

 other very little, lamelliform, nearly horizontal. Muscular imprints oval. 

 Pallial line entire. Surface covered with strong concentric ribbing. Lun- 

 ule lancetlike. Inner margin feebly dentate. Locality. — Claiborne, Ala., 

 Monroe Co. 



We have nothing corresponding to Meyer's description and 



