THE NAUTILUS. 27 



Subemarginula yatesi Dall. It was a very pleasant surprise to 

 find this species previously known, I believe, only from near 

 Monterey, California occurring at Forrester Island. It was, 

 however, quite rare and, though particularly sought for, only 

 nine specimens were taken. Five of these were living when 

 found and the other four dead. One small live one was taken 

 at extreme low water mark and all the others were dredged in 

 from 15-30 fathoms. The largest, a dead one, measures 77 x 57 

 millimeters. 



Fissuridea aspera Esch. Common along low water line. 



Megatebenmis bimaculatus Dall. Fairly common on rock walls 

 near low water mark. Largest measuring 18x13 millimeters. 



Leptochiton cancellatus Sby. Dredged in 20 fathoms. 



Tonicella lineata Wood. Adults common along low tide line. 

 Young rather common in 15-20 fathoms. 



Tonicella ruber Linn, lonicella submarmorea Midd. Dredged 

 in from 15-30 fathoms; the latter the most plentiful. 



C'yanoplax raymondi Pils. Schizoplax brandti Midd. Common 

 locally along low tide line, generally in crevices in rocks. 



Ischnochiton interstinctus Gld. Ischnochiton mertensi Midd. 

 Abundant at from 10-20 fathoms. 



Ischnochston willetti Berry. (Proc. Cal. Acad. Sci., vol. 7, p. 

 236). Ischnochiton trifidus Cpr. Taken at about the same depth 

 as the last but in much smaller numbers, willetti being fairly 

 common and trifidus rare. /. radians was taken at Waterfall 

 but not on Forrester. 



Ischnochiton retiporosus Cpr. Occasional in from 15-50 fathoms, 

 occuring in deeper water than any other chiton found in the 

 locality. 



Trachydermon flectens Cpr. A few dredged in from 15-30 

 fathoms. 



Mopalia ciliata Gld. Mopalia ciliata wosnessenskii Midd. Fair- 

 ly common from a little above low water line to about 15 

 fathoms. I find considerable difficulty in differentiating these 

 two forms but Dr. S. S. Berry tells me that, while most of my 

 specimens are referable to wosnessenskii, there are a few that are 

 nearer true ciliata. 



Mopalia hindsi Rve. Mopalia lignosa Gld. Rather rare on 



