304 FISHES CHAP. 
In Otolithus (Fig. 180) two short tubular canals are given 
off from the antero-lateral angles of the bladder, each sub- 
sequently dividing into two elongated, 
tapering sacs, of which one is directed 
forwards and the other backwards. In 
Corvina lobata (Fig. 181) the lateral 
margins of the bladder are everywhere 
fringed with a series of tufts of caeca, 
each tuft being connected by a_ short 
common canal with the cavity of the 
organ. In the“ Drum ” (Pogonias chromis) 
(Fig. 182) each side of the anterior third 
of the air-bladder has a series of digitately 
branched caecal appendages, the most 
posterior of which on, each side are con- 
nected by a tubular canal, also bearing 
branched caeca, with the corresponding 
postero-lateral extremity of the bladder. 
PU rn BAe eer Collichthys* has a still more remark- 
Otolithus. (From Cuvier able arrangement. In this Sciaenoid 
and slengieries (Fig. 183) twenty-five tubular branches 
are given off from each side of the bladder, all of which soon 
subdivide into a dorsal and a ventral 
division. These still further divide, and L, WZ 
their branches either end blindly or are g CIS 
prolonged into a series of arches to the 
mid-dorsal or mid-ventral line as_ the Z, S 
case may be, where they become con- 
tinuous with the corresponding branches 
of the opposite side. The series of dorsal 
branches, enveloped in their peritoneal 
investment, extend between the body of 
the air-bladder and the roof of the body- 
cavity, while the corresponding ventral 
branches, similarly invested, surround 
that part of the coelom which contains ,,, 48) Aair-bladder of 
the stomach, intestine, and liver. Corvina lobata. (From 
(d) In addition to the subdivision of  Ctvie #4 Valenciennes.) 
the cavity of the air-bladder by the externally obvious, trans- 
1 Giinther, Brit. Mus. Cat. Fishes, ii. 1860, p. 313. 
