158 Bulletin 39 330 



The Banana River beds contain a large species of Polhiices 

 which appears to be this Dominican species. It differs from the 

 recent mammillaris Lamarck, of the Costa Rican and Panana 

 coast by its much narrow iimbiHciis. Its surface is lined with 

 very fine spiral threads. 



Young shells may be mistaken for the subclausa which oc- 

 curs in the same beds, and careful study is sometimes necessary 

 for their separation. The present shell is less heavy, with a 

 higher spire and more convex spire whorls. The umbilicus is 

 much narrower, and a smaller callus on its inner lip v/hich shows 

 but faintl}^ the transverse groove. The surface of sjibdausa is 

 smooth, but in Stanislas- Mexinieri very finely lined with minute 

 spirals. 



Gabb has described from Sapote, Costa Rica, a Natica emi~ 

 nuloides which in form resembles j^oung shells of the Stanislas- 

 Meunieri. His figure shows a different shaped umilicus and no 

 transverse groove on the callus of its inner lip. 

 Length or altitute 44, diameter 38 mm. 



Gatun Stage: Hill la 2, j>, Banana River, C. R. 



Subgenus ^EVERITA Risso 



P-ieverita Kereidis iviaury 



Neverita nereidis Maury, 1917, Bull. Amer, Pal., vol. 5, p. 301, pi. 23, 

 figs. 17, 18. 



Our collection from ths Lower Gatun of Red Cliff Creek, 

 contains a fragment of this very interesting species. The N. 

 nereidis described b}^ Dr. Maury, from the Cercado formation of 

 Santo Domingo, is closely allied to the recent West Coast A^. 

 glauca Humboldt. The Miocene A^ nereidis is less broad, with 

 a narrower umbilicus and a larger umbilical callus. 



Gatun Stage: Coll. 6, Red Clijf Creek, C. R. 



