_ 515 - 



has been confused with. D. aequalis Trabb (l), desGi'ibec' from 



(1). ■'r^ns. An. Philos . Soc, ner s.->r. , vol. 15, n. r49, 187!?. 



Santo -iJominffO, but that species is larger, !■ lOqailateral, 



v.'ith a shorter and less steep ant ero-r!orsal margin, more bluy.t- 

 Ij" ro^mdeo anterior end, straigrhter postero-dor sal niarf^-in and 

 ctronc^er hinge. The Oosta Rican Pliocene D. mqenensis "-sbb (^) 



(2). Jonr. Aoad. Fat. Sci. , Philadelphia, 2nr] ser., vol. 8, 

 ■n. ?^71, .^1. 47, flo-. 72, 1881. 



is smaller, nore elongated, v/ith a more rounrled posterior slope 

 an''' '■-'Te conve:-: postero-dorsal raarp'in. 



The nanie is given for ilr, Arthiir. Lennox, a nienber of the 

 earlj? Jamaican Sirrvej'. 



OoGurrence.- icwer Miocene: Bov.den be^ls, 3or;den, Jamaica. 



