54 BUT.LETIN 31 54 



Localities. — St. Maurice, La. and Sabine River, Texas side. 



Area (cucu'loides?) var. ludoviciana n. var. II. 22. Figs. 8-16. 



Conrad described cucuHoides in his Foss. Shells Tert. Format., 

 i^33> P- 37 ; ^iid we have repeated the description in vol. 2 of 

 these Bulletins, p. 239. Dr. Sheldon has recently discussed the 

 species in the first number of Palceontographica Americana. We 

 here give, for the first time, a figure of what appears to be Con- 

 rad's type of the species in the Collection of the Phila delphia 

 Academy (PI. 22, fig. 17). This slightl}' deformed specimen 

 quite likely belongs to the same species as the Jacksonian lima as 

 Sheldon maintains. Conrad's specimen from "Claiborne, Ala." 

 might well have fallen down from some Jackson horizon above 

 the Claiborne "sands". We have in our various collections from 

 the latter horizon at Claiborne never found any specimens of this 

 shell. 



Our new variety ludoviciana does not have the ribbing on 

 the different parts of the shell perhaps quite so markedly differ- 

 entiated as in typical cucidloides nor is there the umbonal carina- 

 tion so depended upon by Sheldon for identification of the spe- 

 cies. Yet there is a tendency to the same type or ribbing and in 

 a few small specimens (see fig. 11) the post-umbonal slope is 

 sharply differentiated from the remainder of the shell. This early 

 form seems to have some features in common with both cncnlloides 

 and nrississippiensis. 



Types. — Deposited in Paleont. Mus. Cornell Univ. 



Horizon. — St. Maurice Eocene. 



Specimens figured . — In C. U. Mus., from Sabine R . 



Localities. — Smithville, 2 miles E. of Alto, San Antonio F'y, 

 Alabama Bluff, Campbell Cr., etc., Texas ; vSabine River, Vivian, 

 Roberta, Winnfield Marble Q'j', Atlanta well, La. ; base of bluff, 

 Claiborne, Ala. Obscure impressions near Grovetown, Ga., seem 

 to belong here. The distribution of this variet}' is much more to 

 the west than was the case with rhomboidella and its close rela- 

 tives. 



