- 550- 



gins. ihe Lliocene P. f ore man 1 (Ooiiracl) (l) acialler, j.ess 



(1). Jour. Acacl. ilat. Sei., xhllaclelpliia, vol* 8, p. 18-1, 1842; 

 ?os. Ilea, Ter. U. S. , . "1, pi. 40, "■ . 4, 1345 fas 

 Liioiija foreripiii) 



roimde.d and hecvier and ?. anodonta (Say) (2) is much heavier. 



(2), Jour. Acad. Nat. Sol., Philauel-ohia, vol. 4, p. 146, 

 -nl. 10, fi£:'. 0, ■13S4, fas Luoina ano^Q-ita ). 



more eom'oressed and less orbicular. 



Oecurrenoe. - lov/er lliocene : liov/den oeds, Bov/den, Jamaica. 



