RETINA OF LATERAL EYES OF SPHENODON PUNCTATUS. 305 
On the Histological Structure of the Retina of 
the Lateral Eyes of Sphenodon punctatus, 
with Special Reference to the Sense-cells. 
By 
Freda B:»ge, HI.Sc. (Melbourne), F.L.S. 
(From tlie Zoological Department, King's College, University 
of London.) 
With Plates 27—29. 
I. Introduction. 
The following work on the structure of the retina in 
the lateral eyes of Sphenodon punctatus has been done 
in the Zoological Department at King’s College (University 
of London), at the suggestion and with the help of Professor 
Dendy. I have to thank him both for his help and advice 
throughout, and for the use of his valuable collection of 
Sphenodon material. I have not only had a considerable 
number of eyes at my disposal, but I found them in an 
excellent state of preservation for histological work. 1 
should like here to thank, also, Mr. R. W. H. Row, R.Sc., for 
his kindness in taking photographs. The investigations are 
based entirely on microscopical preparations made from this 
already preserved material. No fresh material has been 
available, and for this reason I have found it advisable to 
confine the detailed work for the most part to the structure 
of the visual cells, dealing, as regards the remainder of the 
retina, only with those parts which are visible without 
special treatment for nerve-fibres. 
