6 THE AMERICAN MONTHLY [Jan. 



mucli attenuated in the position usually assigned to the 

 metapore. 



13. The metaplexus is apparently formed by crowding 

 a V-shaped membrane between two nearly parallel edges 

 of the cerebellum and the oblongata. 



14. The roof of the epicoele is at first a membrane. The 

 union of the lateral halves of the cerebellum across the 

 meson is secondary, the connecting membrane being re- 

 placed by a mesal lophius. 



15. The widely divaricated condition of thegeminain 

 birds is not due to crowding by the cerebrum and cere- 

 bellum but to their intrinsic growth begun before any 

 crowding could occur. 



16. There is suggested the possible identity of the 

 double sulcus ventrad of the postcommissure with the 

 pair of lateral outgrowths occurring caudad of the epi- 

 physis, discovered by Locy. 



17. The diaplexus of the turtle consists, in large part, 

 of foldings of the membrane at either side of the meson. 

 In this respect it has a closer relationship with the mam- 

 malian type than the mesal plexus of either the bird or 

 the Amphibia. 



18. In both turtle and sparrow, the paratela; occupy- 

 ing the rima or interval between the fimbria and the 

 tenial edge of the striatum, it is morphologically a part 

 of the roof of the prosocoele. 



19. Various pockets of endyma were found upon the 

 meson which have great significance for morphology, but 

 are physiologically of slight importance. Among these 

 pockets is the paraphysis found in the adult Amyda and 

 in the embryo sparrow\ 



20. In Amphibia^ turtle and sparrow, a transection of 

 the hemicerebrum shows essentially a delta form. Caudad 

 of the rima the three limbs are : (1.) The ventral or 

 striatal ; (2) the lateral or pallial ; (3) the mesal. The 



