454 TLL S| COLIN ALY OF MGLAQE OG NE 
Margarita pupilla, Gould——-which are found on or about Santa 
Catalina Island are only known elsewhere on the coast to the 
north; while it forms the northern limit of four species, Chorus 
belchert, Hinds; Nucula exigua, Sowerby; Omphalius fuscescens, 
Philippi; Ostrea conchaphila, Carpenter. 
These facts indicate that fauna of Catalina Island has been 
little affected during a time when many species on the mainland 
jhave become extinct and others forced to migrate. The fauna is _ 
largely northern, though possessing a few southern forms. It 
thus resembles quite strongly the fauna studied at San Pedro and 
called in this paper Pliocene. 
This case is interesting, not alone from showing that the 
fauna considered Pliocene on the coast of the mainland is still 
living on or about the island, but from the way the deductions 
made from the topography and from the fauna support each 
other. GEORGE H. ASHLEY. 
STOCKTON, CAL., 
April 6, 1895. 
