. The Cambridge natural history. Zoology. AIR-BLADDER 305 verse, or longitudinal constrictions already described, or by the growth of simple or branched prolongations, the organ is often chambered or sacculated by the development of internal septa or partitions. In many of the Gurnards {Trigla) ^ the cavity of the bladder is divided into two intercommunicating compartments by a transversely - disposed and centrally-perforated diaphragm. The large air-bladder of some species of Erythrinus ^ is subdivided internally into numerous alveoli or sacculi. In Notopterus a longitudinal septum divides th
. The Cambridge natural history. Zoology. AIR-BLADDER 305 verse, or longitudinal constrictions already described, or by the growth of simple or branched prolongations, the organ is often chambered or sacculated by the development of internal septa or partitions. In many of the Gurnards {Trigla) ^ the cavity of the bladder is divided into two intercommunicating compartments by a transversely - disposed and centrally-perforated diaphragm. The large air-bladder of some species of Erythrinus ^ is subdivided internally into numerous alveoli or sacculi. In Notopterus a longitudinal septum divides the cavity of the abdominal portion of the bladder into two lateral chambers, which, however, freely inter- communicate anteriorly. In the great majority of the Siluridae ^ the cavity of the organ is divided by a characteristic T-shaped arrangement of a primary transverse and a longitudinal septum into three com- municating chambers, of which one is anterior and transversely disposed, and two are posterior and longitudinally arranged (Pig. 222). The posterior compartments in many genera are still further divided by the growth of secondary transverse septa, extending outwards from the median longitudinal septum, without, how- ever, reaching the external lateral walls of the chambers. In a few genera, as in certain species of Pangasius^ additional fibrous bands and ridges passing between the primary and secondary. FlQ. 182.—Air-bladder of Pogonias chromis. (From Cuvier and Valenciennes.) ^ Moreau, Compt. Bend. lix. 1864, p. 436. ^ J. Miiller, £er. d. k. Akad. d. Wiss. Berlin, 1842, p. 177. ' Bridge and Haddon, op. cit. p. 234, PI. II. Fig. 18. VOL. VII •• Ibid. p. 216. X. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1
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