234 



Transactions. — Zoology. 



Fig. 



7. 



Fig. 



8. 



Fig. 



9. 



Fig. 



10. 



The brain, from above, with the lateral mid, and cerebellar ventricles opened 



on the right side. 

 The middle portion of the brain from beneath. 

 The brain from the left side. 

 The brain in longitudinal vertical section. 



Figs. 7-10, all nat. size. 

 cb, cerebellum. o. c, optic chiasma. 



cb. v, cerebellar ventricle, o. I, optic lobes. 



olf, olfactory lobes. 

 olf. v, olfactory ventricle. 

 pd, cerebellar peduncles. 

 pre, unpaired portion of 

 prosencephalon and 

 prosocoele. 

 pty, pituitary body. 



Fig. 11. 

 Fig. 12. 

 Fig. 13. 

 Fig. 14. 

 Fig. 15. 



c. c, crura cerebri. 



c. h, cerebral hemisphere. 



inf, infundibulum. 



1. t, lamina terminalis. 



I. v, lateral ventricle. 



in. o, medulla oblongata. 



m. v, mid- ventricle. 



Side view of embryo of first stage (X 10). 



Side view of embryo of second stage (x 6). 



Side view of embryo of third stage (X 3). 



Under view of head of embryo of third stage 



Side view of adult female (about J nat. size). 

 br. 1, first, and br. 5, last gill-cleft. 



c, caudal fin, (in fig. 11, end of tail). 



d, 1, first, and d. 2, second dorsal fin. 



e, eye. 



e. br, external gills. 

 /. b, fore-brain. 

 h. b, hind-brain. 

 m, mouth. 



r. b, restiform bodies. 

 sp. c, spinal cord. 

 s. v, saccus vaseulosus. 

 the, thalamencephalon. 

 v. 3, third ventricle. 

 v. 4, fourth ventricle. 

 ii.-ix., roots of cerebral 

 nerves. 



;x3). 



m.b, mid-brain. 



mn, mandible. 



na, nasal aperture. 



pc, pectoral fin. 



pt. q, upper jaw. 



pv, pelvic fin. 



so. s, somatic stalk. 



sp, spiracle. 



xy, and x'y' (in fig. 13) lines along 



which the sections shown in figs. 



5 and 6 are taken. 



Art. XXX. — On the Connection of the Air-bladders and the Auditory -organ in 

 the Red Cod (Lotella bacchus). By T. Jeffery Parker, B.Sc.Loud. 

 Professor of Biology in the University of Otago. 



[Read before the Otago Institute, Qth May, 1882.] 

 Plate XXXIII. 

 In his " Study of Fishes "* Dr. Giinther says, — " In many Teleostei a most 

 remarkable relation obtains between the organ of hearing and the air- 

 bladder. In the most simple form this connection is established in Percoids 

 and the allied families in which the two anterior forms of the air-bladder 

 are attached to fontanelles of the occipital region of the skull, the vestibu- 

 lum occupying the opposite side of the membrane by which the fontanelle 

 is closed. 



p. 117. 



