Herrick, Brain of Certain Reptiles. 105 



Fig. 4. The epiphysis of a turtle [Cisfndo] from a model composed from 

 sections. (Sore>isc?t.) 



Fig. J. Longitudinal section of the brain of Cistiuio to show the relation 

 of epiphysis and paraphysis. [Sorcnsen.) 



Fig. 6 and 7. Longitudinal sections of the brain of Plirynosoma. The 

 curious reversion of the cerebellum is well seen. 



Figs. S-io. Superficial views of the brain of Pliryniosoma. The olfactory 

 tuber injured and mostly torn away. It is in reality as long as the whole cere- 

 brum. 



Fig. II. The mid-dorsal region of the head of Phrynosonia to show the po- 

 sition of the parietal eye. 



-PLATE VIL 



Sections through the brain of the black snake. 



Fig. I. Longitudinal section laterad from the median line, showing term- 

 inal structure of the olfactory tuber and its mesal fossa. Br. opt. optic brachia, 

 cent. I. central lobule of axial lobe, corp.forn. corpus fornicis, prcc. precommis- 

 sure, genie, geniculatum, pes. pcd. pes pedunculi region, where the interchange 

 between the ventral peduncle tract and cerebellum is affected. 



Fig. 2. Nearly median section. Gloin. gloraerules, prep , postp. prae- and 

 postparaphyses, infe. infracommissure, syl. c. sylvian commissure. 



Fig. J. Section at the point of exit of the oculo-motor nerve, JiDid fimbria, 

 lem. lemniscus. 



Fig. 4. Horizontal section through the precommissure, /. fornix, y fibres 

 from the occipito-basal lobe to thalamus, se)is. cor. sensory cortex, a. hippo- 

 campus, rad. lat. olf. lateral radix on its way to the nucleus sphaericus or occi- 

 pito-basal lobe [oe.-b. I.) genie, geniculatum, post. p. c. post-peduncle of cerebel- 

 lum, med. p. c. medi-peduncle of cerebellum. 



PLATE VIIL 



Fig. I. Portion of a perpendicular section through the brain of a black 

 snake to show the relations of the paraphy.ses, hippocampal commissure, fornix 

 and precommissure. 



Fig. 2. Horizontal section through the same region. 



