142 FREDERICK TILXKV AM) LITIIKH F. WARREN 



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

 opens into the ventricle. The proximal tubular portion is 

 present. The di-tal 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. Chalddes trid<ict//hix. Spencer ('86) ; 366 Leyclig ('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. Ilinnlin. McKay ('88) ;-' Sorensen ( J 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. ScinriiN tijUridnnlis. Prenant ('96). 313 There is a parietal 

 eye and a parietal foramen well developed in this form. 



."). (iniKjijliiH oceHatus. 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. 



CHAMAELEOXTIDAE. 1. Chamaekon vulgaris. Spencer ('86) 

 Owsiannikow ('88) ; 295 Studnicka ('93). ;vl 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 connect ive t issue and not nerve. As to the pari- 

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

 others regard thi> 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. /y/,,m rigris. IJabl-lliickhnrd ('94). In 

 this species there is an oval-shaped glandular struct lire, having 



