THE PINEAL BODY 141 



is not well developed. The eye eventually makes its way into 

 the parietal foramen. The corneal pit is present. 



2. Lacerta viridis. Spencer ( r 86); 366 Leydig ('91). 238 In this 

 form, extending from the parietal organ into the epiphysis is 

 a fibrous strand. The end of the epiphysis is deeply pigmented. 

 The parietal eye is flattened dorsoventrally. The retinolen- 

 ticular transition is gradual. There is much pigment in the 

 retina. The lens is bi-convex. The parietal foramen is present. 

 There is a corneal pit, cornea, and a parietal spot. 



3. Lacerta ocellata. Spencer ('86) ; 366 Leydig ('91). 238 The 

 pineal organ is expended at its distal end with an end-sac proc- 

 ess. The wall is folded to form twelve accessory spaces in the 

 epiphysis. The end of the epiphysis is pigmented. There is a 

 parietal nerve and a well-developed parietal eye which is globu- 

 lar and slightly flattened. The retinolenticular transition is 

 gradual. The retina is pigmented and contains cylindrical and 

 ganglionic cells. The lens is bi-convex. The capsule is well 

 developed. The parietal foramen contains the eye. The 

 parietal cornea is present. There is also the parietal spot. 



4. Lacerta agilis. Owsiannikow ('88) ; 295 Leydig ('91) ; 238 

 Studnicka ('93). 384 The pineal organ is present in the form of an 

 epiphysis, which is saccular and has a hollow stalk. The parietal 

 nerve, according to Leydig ('96), 239 is present. It takes origin in 

 the ganglion habenulae and extends to the parietal eye. This 

 eye is a flattened, saccular vesicle. The retina and lens are 

 sharply demarcated. The retina is less pigmented than in other 

 forms. It is connected with the brain by a parietal nerve. The 

 lens is bi-convex. There is a special parietal sheath made up of 

 connective tissue. The parietal foramen, corneal pit, and 

 parietal spot are present. Exceptionally, the foramen is closed 

 by bone. 



5. Lacerta muralis. Leydig ('91) ; 238 Studnicka ('93) , 384 

 The epiphysis is present as is also the parietal eye. The retina 

 is deeply pigmented. The corneal pit and parietal spot are 

 also present. 



SCINCIDAE. 1. Cyclodus gigas. Spencer '86). 366 The pineal 

 organ arches forward over the hemispheres to enter the region 



