Note 48 — Chapter VIII · THE BUILDING OF REEFS

The duller coloured and peculiarly shaped “bladder” or “parrot” fish, Tetraodon or “four tooth” is distinguished by its peculiarly rounded shape and alteration of scales into spines. Though its teeth are very similar to the coral eater, Pseudoscarus, it eats softer animals, e.g. Ascidians and Echinoderms, and sometimes shell-fish.