396 



MABEL BISHOP 



The outer walls of the conjoined hindbrains are of normal 

 thickness and contain fiber tracts, nerve roots, and reception 

 nuclei characteristic of a normal embryo. These are reserved 

 for comment under their respective headings. 



Fig. 10 Section through the cerebellum, motor roots of the median seventh 

 nerves, the median gasserian ganglion (conjoined), and the median eyes. S. 188. 



Cavity of the rho7nhencephalon . The fourth ventricles of the 

 head members are confluent, but maintain the rhomboidal shape 

 described for a single ventricle, although enlarged in proportion 

 to the size of the teratological embryo. Lateral recesses are 

 well developed on the normal sides of the ventricle, but there is 



