876 DEVELOPMENT AND STRUCTURE OF PINEAL EYE IN LACERTILIA, 



THE DEVELOPMENT AND STRUCTURE OF THE 

 PINEAL EYE IN HIXULIA AND GRAMMATOPHORA. 



By W. J. McKay, B.Sc. 



Plates xxii.-xxiv. 



As considerable attention has been directed to the subject of 

 the pineal eye since the publication of Professor Baldwin Spencer's 

 paper,* it was suggested to me by Dr. Haswell, that some obser- 

 vations on the development of this organ might be of interest. 

 What work I have done has been carried out at the Biological 

 Laboratoi'y of the Sydney University, through the kindness of 

 Dr. Haswell, whom I have to thank for supplying me with portion 

 of my material, and for his advice whilst I was working in the 

 Laboratory. 



The material I have had, has been various stages in the develop- 

 ment of three of our most common species of lizards, Hinulia 

 ( Lygosoma) tceniolata, I/hiulia sp., and Grammatojihora (Amphi- 

 bolurus) muricata. In the case of the latter, and I should think of 

 Ilinulia, development advances considerably before the ova have 

 left the parent ; so that it is necessary to oljtain the ova in the 

 lizard about the beginning of November, if the earliest stages are 

 required. 



In preparing the embiyos in the eai'liest stages, I fixed with 

 corrosive sublimate and hardened with alcohol ; stained with borax 

 carmine (Grenacher) and hjematoxylin (Ehrich's) — the latter giving 

 excellent results, — and then embedded in paraffine, after which 

 riltbons of sections were cut with the rocking microtome. 



♦Quarterly Journal of Micro. Science, Oct., 1886. 



