xvi Journal of Comparative Neurology, 



the cerebellum through the bulbar collaterals, and, finally, with all the 

 motor niduli of the medulla and spinal cord. 



The Histology of the Infundibular Region. 



Dr. Berkley has collected his previous papers on this subject and 

 presented them, together with some new matter, in a richly illustrated 

 monograph appearing in the Winter number of Brain for 1894. One 

 of the most interesting results of these studies is the light thrown up- 

 on the structure and relations of the neurolglia cells in adult brains. 

 Earlier writers have supposed that the embryonic supporting substance 

 of the brain and spinal cord — the ependymal neuroglia — almost en- 

 tirely atrophies and disappears in the adult mammal. Dr. Berkley 

 finds, however, several varieties of ependymal neuroglia cells extend- 

 ing from all portions of the middle and inferior regions of the cavity 

 of the third ventricle, and reaching to the periphery, all portions, 

 bodies, branches, tentacles, being readily distinguishable. Such 

 structures are not, then, confined to embryonic brains or adult rep- 

 tiles, amphibians and fishes, and their importance as constituents of 

 the so-caHed gelatinous tracts becomes more and more evident. 



Accessory Parietal Eyes in Anguis fragilis.* 



This is a preliminary notice of the results of an investigation 

 carried on under the auspicies of the Elizabeth Thompson foundation. 

 The most interesting results are those concerned with the variability 

 of the organ. 



1. The number of cases of accessory parietal eyes is only a little 

 less in embryos of the blind worm than the cases of the absence of 

 these structures. The presence of an accessory parietal eye is then 

 an extremely frequent anomaly with the embryos. 



2. Exceptionally there is found in the same individual two and 

 even three accessory eyes. 



3. These eyes are generally out of the medial plane of the head. 

 According to their situation with reference to adjacent organs we may 

 distinguish; Interparieto-epiphysial eyes, situated between the epi- 

 physis and the principal eye, the most frequent ; epiphysial eyes, 

 joined to or incorporated with the epiphysis; intraparietal eyes, in- 

 cluded within the principal parietal eye ; choroid eyes, next to the 



iPRENANT, A. Les yeux parietaux accessoires d'Anguis fragilis sous le 

 rapport de leur situation, de leur nombre et de leur frequence. Bibliogr. Anat,, 

 II, 6, Dec, 1894. 



