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. 
Megatebennus 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. ‘Tonicella submarmorea Midd. Dredged 
in from 15-30 fathoms; the latter the most plentiful. 
Cyanoplaz 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. J. 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 
