P T. A T K X X XVI. 



I'l.liii'KXK I'EC'TENS. 



[l^nlt'ss (itluTU isf slalcil :ili tigiiri's arc aiipruxjinuti'ly natural si/.c] 



Pase. 



Fid. 1. I'nii'ii {I'«liiiiiiin-lni) Iwitlnjl ii. j-p. U. S. N. M. 154 Ui2. Cotype UK 



Kxici-inr (if left v.il\r; iiltitmlr 141 niiii. San llicijn funiiatiiin (Plicicene), Pacific P>eacli, 

 Sail Diego County, CaL ( M. P..) 



Fill. 111. .Same specimen us lig. 1 103 



Prolile of left, valve, as viewed from the rear. (M. P.j 



216 



