Literary Notices. cxxvii 



3. The odd eye is an evagination from the dorsal wall of the inter- 

 mediate brain and constitutes a continuous optic vesicle. It shows 

 itself relatively late in its embryological evolution and cannot be invoked 

 as a proof of the duality of origin of the parietal organ. 



4. The azygos eye is not met with among the chordata. It is an 

 ancestral eye which has disappeared in many of the actual forms. The 

 primitive optic vesicle is still recognizable among the Cyclostomes and 

 Saurians; it is rudimentary in the Teleosts. 



5. The epiphysis is also derived from an evagination of the inter- 

 mediate brain; it does not represent the optic pedicle of the parietal eye. 

 It does not reveal optic characteristic even among the Selacians in which 

 it is highly developed. 



6. The azygos eye and the epipysis appertain to the diencephalon ; 

 the paraphysis depends upon the anterior brain of which it is nothing 

 more than a diverticle. This paraphysis does not show optic characteris- 

 tics in any phase of its developments. It gives birth to one or more sec- 

 ondary vesicles in the epitelial walls which cannot be confounded with 

 the parietal eye. 



7. Of the three encephalic diverticles so marked in Saurians the 

 parietal organ is the only one that has certainly had sensory functions. 



RECENT LITERATURE. 



Allport, F. Purulent Brain Deposits, and Phlebitis and Throm- 

 bosis of Cerebral Veins following Ear Disease. Jouru. Am. Med. Assoc, 

 XIX, 20. 



Antomni. Le circonvoluzioni cerebrali nei mammiferi domestici. 

 Giornale Anat., _fistoL c patal. di animali, XXIII, 3, 1892. 



Arnoldi, Friderici. Icones nervorum capitis, editio altera atque 

 emendatior. J. C. Mohr, Heidelberg, 9 plates, 1S90. 



Bardescu, N. Cercetari assupra topografici cranio-cerebrala. Inst, 

 de chir. Bucuresci, 1892, II. 



Beer, T. Ueber die Verwendbarkeit der Eisen-chlorid-Dinitrores- 

 orcinfarbung fiir das Studium der Degeneration peripheren Nerven. Ar- 

 beiten ans deni Inst. f. Anat. 11. Pliys. des Ccnti-alnervensystcvis, Vienna. 

 1892. 



