234 Transactions.—Zoology. 
Fig. 7. The brain, from hi with the lateral mid, and cerebellar ventricles opened 
on the right si 
Fig.8. The middle portion af the brain from beneath. 
Fig. 9. The brain from the left side. 
Fig. 10. The brain in longitudinal pare section. 
Figs. 7-10, all nat. s 
cb, cerebellum 0.C, i dpi chiasma. r. b, restiform bodies. 
€b. v, eosebelis ventricle. o. l, optic lobes. sp. €, spinal cord. 
€. €, crura cerebri. olf, olfactory lobes. s. v, saccus vasculosus. 
c. h, sse epos olf.v, olfactory ventricle. thc, thalamencephalon. 
inf, infundibulum. pd, cerebellar peduncles. v.3, third ventricle. 
lt, "irum minas pre, unpaired portion of . v. 4, fourth ventricle. 
l. v, lateral ventricle. pros a and 1.-Ix., roots of cerebral 
m. o, medulla oblongata. prosoccele. nerve 
m. v, mid-ventricle. pty, pitnitary ai 
Fig. 11. Side view of embryo of first stage (X 
. )- 
Fig. 14. Under view of head of embryo of third stage (x 3). 
Fig. 15. Side view of adult female (about 4 nat. siz e). 
br. 1, first, and br. 5, last gill-cleft m. b, mid-brain. 
c, caudal fin, (in fig. 11, end of tail). mn, mandible. 
d. 1, first, and d. 2, second dorsal fin. na, nasal aperture 
e, eye. pc, pectoral fin 
e. br, external gills. pt. q, upper jaw 
A : fore-brain. pv, pelvic fin. 
b, hind-brain. so. s, somatic stalk. 
m, nicoth. sp, spiracle. 
ay, and z'y' (in 13) lines e: 
which the stations shown in figs 
5 and 6 are take 
Art, XXX.—On the Connection of the Air-bladders and the Auditory-organ in 
the Red Cod (Lotella bacchus). By T. Jerrery Parker, B.Sc.Lond. 
Professor of Biology in the University of Otago. 
(Read before the Otago Institute, 9th May, 1882.) 
Plate XXXIII. 
Ix his ** Study of Fishes "* Dr. Günther 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 Pereoids 
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. 
TA HE 
