EARLY DEVELOPMENT OF HEMISPHERES 293 
3. The floor plate of His ends in the fovea isthmi. 
4, Between the fovea’ isthmi and the preoptic recess the mid- 
ventral portion of the neural plate is occupied by the continuity 
of the lateral basal laminae. 
5. Between the preoptic recess and the lamina terminalis the 
mid-ventral portion of the neural plate is occupied by the 
terminal ridge, the continuity of the lateral alar plates. 
6. The cerebral hemispheres are evaginated from alar laminae 
alone and show a cephalo-caudad lamination upon which is im- 
posed the dorso-ventral lamination of Herrick. 
LITERATURE CITED 
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embryos. Jour. Exp. Zodl. vol. 20, pp. 27-57. 
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1920 The transplantation of the cerebral hemispheres of Amblystoma. 
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