Oalr Grove 0, !:ialao'Tjn Dall (l), Oaloosahatchic and '■/aceamaw 2.* oclal - 

 li7ra Dall (2) ^.iffer in size and in details of ornament at ion, form- 

 ing a homogeneous gTO-i^x). 



(1^. Toe. cit., :o. 1087, p] . "\ fig. 4, 1900. 



(2^. loc. cit., -;. 1088-1083, -1. i9, "• . ^, 1900 {-0. miiricatnm 

 Tuomej' an'^ Holmes, Pleioo. ?os., trolirji, p. £4, 



pi. 19, fi'--. 2, 1865, non linnaens ) . 



T4ae Tampa silex form seeiaa to be diatinot; it lis XAOxe inflated, 

 not as much produced anteriorly, T/ith a more yy!iimetrieallj7 arcuate 

 "base and slightly ^'.'idpr rii:)S, tlie "oosterior ribs cearing sharper 

 spine b ox^ L'heir posterior aide. 



It should be noted that Gup^iy has not published the occurrence 

 of muricatu.m in "Jamaica", >--S checlr-list (1874) ^irii^ that 

 species from '" - - • ^t ;rinidaO. 



Oco-'rrenee .- Lower Miocene ; 3o'.7dr , a, Jamaica 



(Dall, 1900^ ? ?1' ■ '?■: ^rinidad ' , .-..-> ^ 



