V L XT K X XX \M I r. 



riJOCKNE AND (.iUATERNAKY I'lXTKNS. 



[tinless otherwise stiateil all figures nrc iip(irnxiinjiti-ly imtunil size.] 



Page 



Fic. 1. Pirloi {raliiiiiiiirlni) ciiKiiiiiisCumld. H.A 101 



Exterior of rijilit valve; allilmle l(t."i min. I'liiMcne, Iicailnian Ii-laiifl, Los Anjreles 

 County, Cal. (M. H. ) 



Fk;. 1'(. Same gpeciinen as fij;. 1 101 



Exterior of left valve. 1^1. 1'.) 



Fiii. 1ft. Same specimen as lig. 1 101 



Profile of both valves, as seen from the rear. (M. 1*. ) 



220 



