PLATE XIII. 



MIOt'KNE 1'1'X'TKNS. 



[riilcss ollierwisc slaltMl all tiRiirrs art.' aitproxinialcly natural sizt'.] 



Paee 



Fig. 1 . Prrtcn ( L]iriipi'<ieii) hnwirai n. .sp. V. C. Tyjic 70 



Exterior of U'ft valve, ears imperfect; altitude 150 iiiiii. Mioreiie (lower), Panta Inez 

 Canyon, Santa Barbara County, Cal. (II.) 



Fig. 1(1. Same specimen as fig. 1 70 



I'riitile of both valves viewed from rear. (M. P.) 



170 



