PLATE 3. 

 Group I. — Vagal Lobes, Large. 



29 





O 



-Vagal and Facial Lobes, Small. 



c 

 o 



Group III. — Faclil Lobes, Large. 



S 



V.L. — Vagal lobe. F.L. — Facial lobe. Clm. — Cerebellum. A.T. — Acoustic tuber- 

 cles. OP.— Optic lobes. OK.— Olfactory lobe. OLF.B.— Olfactory bulb. 

 Pall, pallium. — The pallium is only shown in the Carp and Dace. 



Note. — In the barbel, loach and goldfish the optic lobes appear large, as the tecta 

 optica are separated by the valvula cerebelli. The olfactory lobes in the third 

 group are large. The brain of the tench might almost be placed in Group III, 

 as the facial lobe is large as weU as the vagals. 



