- ^.78 - 



Remrlr_s.- Thin n-iecies, v?r. ich is one of the r.os t abiindant 

 of the ■i?ellirjas, i'3 iu.i-.ediately recognized "bi' its smrp sgliIp- 

 ture, sharper than in the average form of the section, ^he 

 radial striae are fine, hat relatively cons-oicnous and thc;^^ 

 finely ■ and sharply crenulate the ed.^^e of the cor:eentric lamellae, 

 except v/hen the lamellae are heavier than usual. The areas be- 

 fore and behind the umbo are flattened, especiall;: on the left 

 valve where the margins are compressed. The aver, ge adiilt is 

 slightly more elongate than the one figured by Dall. 



Occurrence .- lower Miocene: Bowden beds, Bovvden, Jamaica 

 (Dall, 1900). 



