170 TELEOSTEI : PLECTOGNATHI. -- XXII. 



wliich the stomach may be greatly inflated and the fish float belly 

 upward out of reach of its pursuers. 



a. Back not carinated, skin without scutes ; nostril on each side with two 



openings. 



b. D. and A. falcate, of 12 to 16 rays; C. lunate; vertebrae 20; nostrils ses- 

 sile; mucous tubes on head very conspicuous. LAGOCEPHALUS, 243. 

 bb. D. and A. short, rounded, of 6 to 8 rays; C. rounded; vertebrae 18; 

 nostrils at tip of a hollow papilla ; raucous tubes not conspicuous. 



ORBIDUS, 244. 



243 LAGOCEPHALUS Swainson. (Xayo>s, hare ; Kf^aXrj, 

 head.) 



481. L. laevigatus (L.). RABBIT FISH. SMOOTH PUFFER. 

 TAMBOR. Olive green ; silver-white below ; belly with large 3-rooted 

 spines; skin elsewhere smooth. Head 3J; depth 4^. D. 14. A. 12 

 L. 2 feet or more. Cape Cod to Brazil. (Lat., made smooth.) 



244. ORBIDUS Rafinesque. (Lat., orbis, a sphere.) 



482. O. maculatus (Bloch & Schneider). COMMON PUFFER. 

 SWELL-FISH. SWELL-TOAD. Sides of head and body always prickly, 

 as is back from upper lip to D. ; prickles all similar, small, close-set, 

 3-rooted, never obsolete. Dark olive above, marbled and dotted 

 with black ; black blotches on side forming short cross-bars ; C. 

 nearly plain. Head 2|; depth 3. D. 7. A. 6. C. 7. L. 12. Cape 

 Cod to S. C., very common. (Tetraodon turgidus Mitchill.) 



FAMILY XCII. DIODONITIDu3E. (THE PORCUPINE-FISHES.) 



Fishes similar to the Tetraodontidce, but having the teeth of each 

 jaw grown into one ; body with rooted spines ; stomach less ex- 

 tensively inflatable than in the Tetraodontidce. Genera 3 ; species 

 about 10, in warm seas. (Si's, two; o8o>i>, tooth.) 



a. Spines robust, all fixed, and 3-rooted (some of them rarely 4-rooted); nasal 

 tube simple with two lateral openings. . . CHILOMYCTEKUS, 245. 



245. CHILOMYCTERUS (Bibron) Kaup. (xAos, lip; 

 pvKTr)p, nostril.) 



483. C. schcepfi (Walbaum). BURR-FISH. SWELL-TOAD. A 

 ridge above eye. Greenish, with series of parallel blackish stripes 

 covering most of the body above ; an ocellated black spot above P. ; 

 a larger one behind it ; one at base of D. ; a smaller one below it ; 

 fins unspotted. Head 2|; depth 3. D. 12. A. 10. L. 6. Cape 

 Cod to Texas; very abundant S. (C. geometricus Bloch & Schnei- 

 der.) (Farther S. occurs Diodon Tiystrix L., larger, with longer 

 spines, of which some are 2-rooted and movable.) (To Johann 

 David Schopf, a Hessian surgeon in the Revolutionary War.) 



