PRESENCE OP EYES IN SHELLS OF CERTAIN CHITONHLE. 57 
the Smithsonian collection at Washington and gave me some 
specimens from the Pacific coast. 
Dr. Woodward kindly went over the fossil Chitons with me, 
but we could not detect any traces of eyes in them. 
DESCRIPTION OF PLATES IV, V, & VI, 
Illustrating Professor H. N. Moseley’s paper “ On the Presence 
of Eyes in the Shells of Certain Chitonidse and on the 
Structure of these Organs.” 
N.B. — All the drawings, with the exception of fig. 2, PI. IV, figs. 4, 5, 
and 6, PI. V, and fig. 8, PI. VI, drawn by the author, are made from the 
actual shells by a professional artist, Mr. W. H. Hill. 
PLATE IV. 
Fig. 1. — View of a specimen of Schizochiton incisus, preserved in 
spirits, and with the outline of the margin of the mantle somewhat distorted 
in consequence, a. Anterior shell, with six rows of eyes. b. Posterior shell, 
with six rows of eyes. c. Anal notch in the posterior shell, d. One of the 
middle shells, with two rows of eyes. e. Another of the middle shells, which 
bears as an abnormality three rows of eyes, two on one side and one on the 
other. 
Fig. 2. — One of the rows of eyes of a middle shell of Schizochiton 
incisus much further enlarged. 
Fig. 3. — A single eye from the same specimen as the above, still more 
highly magnified, b. Calcareous cornea, g. Lens, bordered by the apertures 
of the iris seen through the cornea, c. Pigmented eye-capsule, seen partly 
through the superficial layers of the general shell substance. 
Fig. 4. — The anterior shell of Schizochiton incisus, outer view; one 
half indicated in outline only. On the finished half three rows of eyes are 
seen borne on raised ridges of the shell. 
Fig. 5. — The same shell ; inner view, a a a. Incisurse marginalis. b b. 
The sutural lines of pores for the passage of nerves, continued from the 
incisurae. 
Fig. 6. — Part of a specimen of Enoplochiton niger, viewed from 
the side. Only a part of one of the middle shells and of the girdle is 
