THE NAUTILUS. 51 



MOLLUSCAN FAUNA OF MONTEEEY BAY, CALIFORNIA. 



BY S. S. BERRY. 



( Concluded from page ^7.) 



Trachydermon flectens var. montereyensis Bartscb. 12 fathoms ; 

 several specimens. 



Chaetopleura gemmea Carpenter. Low tide to 12 fathoms ; quite 

 common in places. Most of the specimens are a rather bright 

 orange-red in color. 



Chaetopleura rosetta Bartsch. A very small species dredged in 

 12 fathoms depth. One specimen was likewise found at low tide. 



Ischnochiton magdalenensis Hinds. This is the commonest shore 

 chiton and lives under boulders in dozens. The young specimens 

 are often very handsome and vary considerably in coloration and 

 marking. 



Ischnochiton mertensii Middendorf. Low tide to 12 fathoms. 

 Not rare. This is also a variable species as regards color and mark- 

 ings, though generally of a brownish-red. The sculpture of fine 

 specimens is wonderfully distinct and is but rarely obscured by for- 

 eign growths, or eroded as in the case of so many of the other species. 



Ischnochiton cooperi Carpenter. Low tide ; but few found. 



Ischnochiton clathratus Reeve. A single oddly-marked specimen 

 was found at low tide by a fellow-student at the laboratory. 



Ischnochiton radians Carpenter. Low tide to 12 fathoms. Two 

 of the specimens found were nearly black, almost unmarked, and 

 with so exactly similar a color pattern (not in the least intergrading 

 with the ordinary form) that the writer was very doubtful as to 

 whether they were properly referred to this species, but they were 

 identified as radians by Dr. Dall. They seem at least a very well 

 marked variety. 



Ischnochiton berryi Bartsch. Six adult specimens and a young 

 one were found in the crevices of the blue clay from 12 fathoms. 

 They were generally living with a purplish sponge which they re- 

 sembled in color. The largest specimen taken measured one and a- 

 half centimeters in length in the living state. 



Ischnochiton veredentiens Carpenter. 12 fathoms; two or three 

 specimens. 



Ischnochiton regularis Carpenter. Three or four specimens were 

 found at low tide. I am told that this is generally a common species 

 around Pacific Grove, but we did not find it so. 



