- 195 - 



0. paras ities . Trmelin (l), an African form, is less elon^f^ated, vatl 



n 



(1). Syst. i:at., vol. 6, p. 5336, 179S; lleeve, Oonch. Icon., 

 Ostrea . pi. T, fig. % 1870. 



fewer plications that extend fiirther uuwoj.-d the njiiho. 'Bom's 

 0, cristata (2) is much broader, v/ith fewer and broader marginal 



("). loc. ait., p. IIP, pi. 7, fig. ,'3, 1870. 



plications. 



Ainor.pr Gabb's Santo Domingian o^.sters are so ^"' "^ ^ornis 



v;hich probably should be referred to this species, althoiagh they 

 are less elongate'i, with fewer lolieations that extend further 

 toward the umbo and poorly develop^, ' olaspers. It iiia; be assLuned 

 that ."'-.'i')b had these forms in raind when he noted the occurrence of 

 "two or T)erhaps three other species of small orsters, amon,? which 

 one appears to be t]':e coniraon mangrove oyster, _u. irons I. (lima- 

 oella lam. ) " ( 3 ) . 



(r), Trens. Am. Philos. Soc, new ser. , vol. 15, p. 258. 



Occurrence .- Lower Miocene: Bowden he's, Bowden, Jamaica, 

 decent: \7est Indies in shallow wate.-. 



