Series Plectognathi 633 
are all very small, three to six inches in length, and prettily 
colored. In the West Indies Tropidichthys rostratus is found. 
Tropidichthys solandri abounds in the South Seas, dull orange 
with blue spots. Tropidichthys rivulatus is common in Japan 
and several other species are found in Hawaii. 
Fig. 529 —Bristly Globefish, Tetraodon setosus Rosa Smith. Clarion Island, Mex. 
Other species occur on the west coast of Mexico, in Poly- 
nesia, and in the East Indies. 
The Porcupine-fishes: Diodontide.—In the remaining fami- 
lies of Gymnodontes, there is no suture in either jaw, the teeth 
Poet Sie a 
SSeS 
Fig. 580.—Porcupine-fish, Diodon hystrix (Linneus). Tortugas Islands. 
forming an undivided beak. The Diodontide, or porcupine-fishes, 
have the body spherical or squarish, and armed with sharp 
thorns, the bases of which are so broad as to form a continuous 
coat of mail. In some of them, part of the spines are movable, 
these being usually two-rooted; in others, all are immovable 
