PRESENCE OF EYES IN SHELLS OF CERTAIN CHITOXID^. 37 
On the Presence of Eyes in the Shells of Certain 
Chitonidse, and on the Structure of these 
Organs. 
By 
II. W. Moseley, F.R.S., 
Linacre Professor of Human and Comparative Anatomy in the University 
of Oxford. 
With Plates IV, V, and VI. 
Introduction. 
On examining a specimen of Schizochiton incisus pre- 
served in spirit amongst a number of other animals dredged 
bv Captain W. Chimmo, R.N., in the Sulu Sea, in H.M.S. 
“Nassau” in 1871, and presented by him to the Anatomical 
Department of the Oxford University Museum, I was astonished 
to remark on the shells certain highly refracting rounded 
bodies, arranged in rows symmetrically; they struck me at 
once as resembling eyes, and further examination proved that 
such is, in fact, their nature. On searching for eyes on the 
shells of other Chitonidse I found them present in many other 
genera, differing, however, in each genus more or less in struc- 
ture and arrangement. I published a preliminary summary 
of what I had been able to determine concerning these eyes 
in the ‘ Annals and Magazine of Natural History* for August, 
1884. In the present paper I enter further into details, and 
have the advantage of elucidating my results by means of 
figures. 
