•iiio - 



which the lamellae have "been removed show miGroscooie vermiciila- 

 tions, like the eanrotonectes striation of certain 2ectens, v&ich 

 reflect li?-ht hrilliantly. 



■2'ae s pe ciiiiens from limon, Josta .-tica, are not cuite as larrre 

 as th^se from "Bov^den and the sciilptiire is slightly finer than on 

 the average 3oi"den form. 



Oecurrence «- lov/er Miocene: Bow den beds. Bow den, Jamaica 

 (Dall, 19C3^. Pliocene: Limon, Oosta Rica (Dall, 1905). 



