the '^aloosahatchie 2* v-' illcoxli {7^ ), all of \fnlch are sinallor 

 and, except for the 1: at, va th a ar.ialler and shallower liinular 

 pit. 0_' h e-'aoyraa Bror/n and Pilsbrj' (4), from the Gat^m he^s, 



(1). loc. cit.. Top. 850-851, pi. 7:6, f i p-s . 12, If', 1898; 19C0. 



(2). idem, p. 851, pi. 3 6, figs. 1-7.. 



(3). idem, pp. 851-852, pi. So, fig. 9. 



(4). Proc. Acad. Liat. 3ci., Philadelphia, tdI. 64, pp. 518-510, 

 pl. 26, firr. 4, 191S. 



is more elong-ate, with fewer concentric imdulationG, finer ra-Hal 

 striae and vathoat the deep deprr -"-•■'. -^n in front of the imbo,- 

 at least on the right valve. 



0?ciirrence »- Upper Oligocene: Santo Dorainp-o (Cabh, 1873; 

 Guppy, 1874, 1876; Dall , 1898); ^ra tun formation, Vamos-vamos, 

 Panama (Dall, 1898); lorjer I'iocene : ^^owden beds, Sov/den, Jamaica 



(Gupoy, 18 66, 1874; Ball, 1398). 



