FIG. 357.—Puffer, inflated, _Spheroides spengleri_ (Bloch). Wood's Hole, Mass. ] [Illustration: FIG. 358.—Puffer, _Spheroides maculatus_ (Schneider). Noank, Conn. ] In _Tetraodon_ the nasal tentacle is without distinct opening, its tip being merely spongy. The species of this genus are even more inflatable and are often strikingly colored, the young sometimes having the belly marked by concentric stripes of black which disappear with age. _Tetraodon hispidus_ abounds in estuaries and shallow bays from Hawaii to India. In Hawaii, it is regarded as the most poisonous of all fishes (muki-muki) and it is said that its gall was once used to poison arrows. _Tetraodon fahaka_ is a related species, the first known of the family. It is found in the Nile. _Tetraodon lacrymatus_, black with white spots, is common in Polynesia. _Tetraodon aërostaticus_, with black spots, is frequently taken in Japan, and _Tetraodon setosus_ is frequent on the west coast of Mexico. This species is subject to peculiar changes of color. Normally dark brown, with paler spots, it is sometimes deep blue, sometimes lemon-yellow and sometimes of mixed shades. Specimens showing these traits were obtained about Clarion Island of the Revillagigedos. No _Tetraodon_ occurs in the West Indies. _Colomesus psittacus_, a river fish of the northern part of South America, resembles _Spheroides_, but shows considerable difference in the skull. [Illustration: FIG. 359.—_Tetraodon meleagris_ (Lacépède). Riu Kiu Islands. ] But few fossil _Tetraodontidæ_ have been recognized. These are referred to _Tetraodon_. The earliest is _Tetraodon pygmæus_ from Monte Bolca. The _Chonerhinidæ_ of the East Indies are globefishes having the dorsal and anal fins very long, the vertebræ more numerous (12 + 17), twenty-nine in number. _Chonerhinus naritus_ inhabits the rivers of Sumatra and Java. The little family of _Tropidichthyidæ_ is composed of small globefishes, with a sharply-keeled back, and the nostrils almost, or quite, wanting. The teeth are as in the _Tetraodontidæ_. The skeleton differs considerably from that of _Spheroides_, apparently justifying their separation as a family. The species 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 ether species are found in Hawaii. [Illustration: FIG. 360.—Bristly Globefish, _Tetraodon setosus_ Rosa Smith. Clarion Island, Mex. ] Other species occur on the west coast of Mexico, in Polynesia, and in the East Indies. [Illustration: FIG. 361.—Porcupine-fish, _Diodon hystrix_ (Linnæus). Tortugas Islands. ]