- 505 - 



gives traota. about t lie sa;ne dirnensions as the .Tssociatel o 1 iv e 1. 1 a , 

 but the.-: niay he "iistingaished hj7 the lower outline^ nore attenuat- 

 ed posterior end , loiip-or and s-^cener -oontero-'"! or nal r-'Trin of 

 traota . 



Occurrence .- Uooer Olir-ocene: Ohi^oola :;!srl, Florida (Dall, 

 1^"'')« Lower Miocene: oowden beds, ;3ov,'den, Jamaica 



(Dall, 1900). 



