142 FREDERICK TILNEY AND LUTHER F. WARREN 



of the parietal foramen. The epiphysis is hollow. The stalk 

 opens into the ventricle. The proximal tubular portion is 

 present. The distal portion is within the foramen. The end- 

 vesicle of the pineal organ comes into this relation. Spencer 

 thought it was a rudimentary eye. The corneal pit, parietal 

 foramen, and parietal spot are present. 



2. Chalcides tridactylus. Spencer ('86) ; 366 Leydig ('91). 238 

 The epiphysis is a globular vesicle. The end is prolonged into a 

 tapering process. The epithelium is much thickened. The 

 parietal eye is separate from the epiphysis. The retinolenticular 

 transition is gradual. The lens is bi-convex. There is a parietal 

 foramen, cornea, spot, and pit. 



3. Hinulia. McKay ('88) ; 255 Sorensen ('94). 363 In this form 

 there is a well-developed parietal eye which is unattached to 

 the epiphysis. The lens is bi-convex. The retina contains 

 rod cells, round cells, a molecular layer, spindle cells, and pig- 

 ment cells. 



4. Scincus officianalis. Prenant ('96). 313 There is a parietal 

 eye and a parietal foramen well developed in this form. 



5. Gongylus ocellatus. Legge ('96). 228 In an embryonic 

 study of this form the epiphysis with a proximal portion and a 

 distal part was present. Only in the embryonic stages was the 

 parietal eye observed. It contains a brown pigment. There is 

 a lens which is bi-convex. The parietal nerve is not present. 

 The parietal cornea, foramen, and spot were not observed. 



CHAMAELEONTIDAE. 1. Chamaeleon vulgaris. Spencer ('86) ; 366 

 Owsiannikow ('88); 2y5 Studnicka ('93). 384 The pineal organ in 

 the form of the epiphysis is a folliculated, hollow sac, which is 

 flexed forward, the walls being much flattened. It runs out into 

 a long, strand-like point. The parietal nerve is probably not 

 present in the adult. The connection between the pineal organ 

 and the eye is connective tissue and not nerve. As to the pari- 

 etal eye, authors differ; some say there is a good lens and retina, 

 others regard this as rudimentary in all respects. There is a 

 good capsule and a good parietal foramen. The parietal cornea, 

 pit, and spot are absent. 



OFHIDIA. 1. Python ligris. Rabl-Ruckhard ('94). 323 In 

 this species there is an oval-shaped glandular structure, having 



