252 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



somewhat backwards into the hollow infundibuluin. If 

 this be now traced posteriorly, it is found first of all to 

 communicate with the cavity of the pituitary body. 

 Almost at the same time, but more dorsally, it is pro- 

 longed on each side into the large cavities of the lobi 

 inferiores, whilst finally it communicates with the cavity 

 of the fine stalk of the saccus vasculosus. The third 

 ventricle therefore is continuous with the cavities of the 

 pituitary body, lobi inferiores and saccus vasculosus. The 

 infundibulum of the Plaice is difficult to delimit, as it is 

 largely merged into the floor of the thalamus. Inciden- 

 tally we may draw attention in the latter to the very large 

 paired nucleus rotundus, which is very striking in sec- 

 tions. Anteriorly the third ventricle passes into the large 

 median ventricle of the fore-brain (prosocoele), roofed over 

 by the pallium. The prosocoele is not prolonged into the 

 bulbi olfactorii as a rhinocoele, the bulbs being solid. 



Cunningham makes two assertions on the brain of the 

 Sole that appear to us to require confirmation. One is 

 that the " position of the brain is almost entirely 

 unaffected by the change which has taken place in the 

 normal position of the fish," and the other is that " the left 

 olfactory lobe is somewhat larger than the right, a differ- 

 ence which is related to the great development of the left 

 olfactory capsule." On the other hand, Malme states of 

 the Sole (op. cit., p. 34) that " insbesondere ..... 

 ist der rechte Lobus [striatum] (derjenige der Augenseite) 

 viel grosser als der linke/' and again that in Pleuronectids 

 generally " der Bulbus der Augenseite ist stets der 

 grosste." Malme's observations agree with ours on the 

 Plaice. Again, Cunningham apparently overlooks the 

 work of Habl-Huckhard on the brain of Teleosts, and 

 describes what are really the corpora striata as receiving 

 prolongations from the third ventricle. 



