58 



FREDERICK TILNEY AND LUTHER F. WARREN 



ment, there has been assembled a formidable array of evidence, 

 Hoffmann, 186 from his observations on Lacerta agilis, Strahl and 

 Martin, 383 in Anguis and Lacerta vivipara, Francotte, 127 on 

 Lacerta vivipara, Klinckowstroem, 207 in Iguana, McKay, 255 in 

 Grammatophora muricata, and Schauinsland, 346 in Sphenodon 

 all advocate this view (fig. 24). 





Fig. 23 Anlage of the epiphyseal complex in a 12mm. larva of Bufo vulgaris 

 according to Beraneck, 1893. 



Po., pineal organ; Ep., proximal portion. 



Beraneck, 23 on the other hand, in his well-known work upon 

 the parietal eye and the morphology of the third eye of verte- 

 brates, concludes that the parietal eye should not be considered 

 as a simple diverticulum of the pineal gland. In Lacerta and 

 Anguis it constitutes an independent organ which develops from 

 the thalamencephalon as the epiphysis, but develops parallel to 

 the latter not dependent upon it. The parietal eye is attached 

 by a neural fasciculus which is transitory and not in any sense 

 derived from the epiphysis (fig. 25). 



