170 TKLKOSTEI : PLECTOGNATIII. — XXII. 



wliich the stomach may bo fjrcatly inflati-d and tlu- fish float belly 

 uiiward out of ivach of its pursuers. 



a. Bni-k not cariiiatud, skin witliout scutes; nostril on each side with two 



openiii(j;s. 



b. D. and A. falcate, of 12 to 15 rays; C. lunate; vertebra; 20; nostrils ses- 



tiile; mucous tubes on head very conspicuous. Lac;(jcei'Hai.us, 243. 



66. D. and A. short, rounded, of 6 to 8 rays; C. rounded; vertebras 18; 



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



Okiudls, 244. 



243 LAGOCEPHALUS Swainson. (Xaywj, hare ; »cf0aXij, 

 head.) 



4K1. L. laevigatua (L.). Raiujit Fish. Smooth Pufkkr. 

 Tamhok. ( )live grei-n ; silver-white below ; belly with larf^e 3-rooted 

 spines; skin elsewhere smooth. Head .'?J ; 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. maculatua (Bloeh & Schneider). Common Puffer. 

 SwEi.i.-Kisn. S\VKLi.-TOAi>. Sides of head and body always prickly, 

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

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

 with l)lack ; lilack V)lotches on side forming short cross-bars ; C. 

 nearly i)lain. Head 2|; depth 3. 1). 7. A. 6. C. 7. L. 12. Cape 

 Cod to S. C, very common. (^Tclraodon turgidus ^litchill.) 



Family XCII. DIODONITID^, (The Porcupine-fishes.) 



Fi.shes similar to the Tctraodontula:, but having the teeth of each 

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

 tensively inllat;iblc than in the Tctraotlontidcc. Genera 3; species 

 about 10, in warm seas, (fit's, two; 6bu)v, tooth.) 



a. Spines robust, all fixed, and 3-rootod (some of them rarely 4-ronted1; nasal 

 tube simple with two lateral opcninf^s. . . Ciiii.<>.MYcrKi<i;s, 245. 



245. CHILOMYCTERUS (Bibron) Kaup. (xelAor, lij) ; 

 fivKTT]f}, nostril.) 



483. C. achoepfi (Wulbaum). Bruu-iisii. .S\vr.i.i.-ToAi>. .V 

 riilgc above eye. Greenish, with series of parallel bl;u-kish stripes 

 covering most of the body alxjve ; an ocellated bla<k spot above P.; 

 a larger one behind it; one at base of 1). ; a smaller one Ixdow it; 

 fins unspotted. Head 2f; depth 3. I). 12. A. 10. L. 6. Cape 

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

 der.) (Farther S. occurs Dindnn fiyalrix L., larger, with longer 

 spines, of wliich some are 2-rooted and mnvablc.) (To Joliann 

 David .'xhopf, a Ht'ssian surgeon in tlic UcvulitinMary ^^^lr.) 



