53^ yo;/r»(7/ of Comparative Neurology and Psychology. 



ABBREVIATIONS USED IN ALL THE FIGURES. 

 a.h.c, auterior bead cavity. 

 ore])., archeuterou. 

 nil., auditory pit. 

 CO., commissura anterior. 

 cJ>I., cerebelliUM. 

 c.li. coiiiiiiissura lial)eiuilaris. 

 cli.op., cliiasnia oplieiuu. 

 c.l)., commissnra posterior. 

 V.S., corpus striatum. 

 tUcnc, dieucephalon. 

 cc, ectoderm. 

 en., entoderm. 

 cp., epiphysis. 



f.L, foramen intervontriculare. 

 hy., hypophysis. 

 l.t., lamina terminalis. 

 III., mouth. 



iikL, mandibular somite and arch. 

 lives., mesoderm. 

 incseiw., mesencephalon. 



iii.m., median mass connecting; the premandibular somites. 

 n., neuropore. 

 ncli., notochord. 

 n.th., nervus thalamicus. 

 0.. bulbus olfactorius. 

 op.i-., optic ridge. 

 op.v., optic vesicle. 

 /).. paraphysis. 

 p'i.eii.. piexiis chorioideus. 

 Iti-.cii.. preoral entoderm. 

 Iir.iii.. premandibular somite. 

 /•./.. recessus infu'ndibuli. 

 r.iii.. recessus mannnillaris. 

 /•./;., recessus neuroiioncus. 

 /■./)., recessus prseopticus. 

 r.po.. recessus postopticus. 

 t., terminal ridge. 

 teh, tela chorioidea. 

 telcnc., telencephalon. 

 thai., thalamus. 



t:in-ee., mesectoderni derived from the terminal part of the neural crest. 

 t.p., tuberculum posterius. 

 V.I.. ventriculus lateralis. 

 v.tr., velum transversum. 



