Lagocephalus laevigatas, composite based on several specimens, 61.4-166 mm SL, Gulf of Mexico: 



195. lateral view of entire specimen 275 



196. lateral view of head 276 



197. dorsal and ventral views of skull 276 



198. posterior view of skull; lateral and posterior views of first abdominal vertebra; posterior view of 



orbit 277 



199. dorsal view of branchial arches and lateral and medial views of hyoid arch 278 



200. lateral view of pectoral girdle 278 



201. lateral view of caudal fin supporting structures 279 



202. Canthigasterrostrata, with C. ualentini and two renditions of C. amboinensis: external features 279 



Canthigaster rostrata, composite based on several specimens, 55.2-96.5 mm SL, Texas: 



203. lateral view of entire specimen 286 



204. lateral view of head 287 



205. dorsal and ventral views of skull 288 



206. posterior view of skull; lateral and posterior views of first abdominal vertebra; posterior view of or- 



bit 288 



207. dorsal view of branchial arches; lateral and medial views of hyoid arch 289 



208. lateral view of pectoral girdle 290 



209. lateral view of caudal fin supporting structures 290 



210. External features of other representative tetraodontid genera: A, Sphoeroides nephelus; B, S. testudi- 



neus; C, S. dorsalis; D, S. lobatus; E, S. pachygaster 291 



211. Nasal organs and olfactory lamellae of representative species of Sphoeroides and Lagocephalus: A, 

 Sphoeroides trichocephalus; B, S. spengleri; C, S. maculatus; D, Lagocephalus spadiceus; E, L. lago- 

 cephalus; F, L. inermis 292 



External features of other representative tetraodontid genera: 



212. Guentheridia formosa 292 



213. Colomesus psittacus 292 



214. A, Amblyrhynchotes piosae; B, A. honckenii; C, A. richei 293 



215. Torquigener pleurostictus and T. hamiltoni 293 



216. Fugu vermicularis 293 



217. Arothron armilla and A. immaculatus 294 



218. A, Tetraodon miurus; B, T. lineatus; C, T. kretamensis; and D, T. schoutedeni 294 



219. Ephippionguttifer of decreasing sizes (325, 232, and 101 mm SL) 295 



220. Photographic detail of interdigitated scale plates from lower side of body of Ephippion guttifer, 325 



mm SL 295 



External features of other representative tetraodontid genera: 



221. Chelonodon patoca and C. fluviatilis 295 



222. Monotreta palembangensis and M. leiurus 296 



223. Chonerhinos modestus 296 



224. Xenopterus naritus 296 



225. Carinotetraodon lorteti 297 



226. Sphoeroides macu/atus, lateral viewof entire specimen, 97.5 mm SL, Virginia 299 



227. Sp/ioeroides pachygaster, lateral view of entire specimen, 80.6 mm SL, Nigeria 300 



228. Guent/iendia/ormosa, lateral view of entire specimen, 175 mm SL, Panama (Pacific) 300 



229. Co/omesuspsjUacus, lateral view of entire specimen, 178 mm SL, Surinam 301 



230. Amftiyr/iync/ioteshoncfeemi, lateral view of entire specimen, 70.7 mm SL, India 301 



231. Amb/yr/iynchoiesric/iei, lateral view of entire specimen, 59.4 mm SL, New Zealand 302 



232. Amb/yr/iynchotes piosae, lateral viewof entire specimen, 33.8 mm SL, Australia 302 



233. Fu^u c/irysops, lateral view of entire specimen, 98.6 mm SL, Japan 303 



234. Fugu o6/orj^us, lateral view of entire specimen, 46.2 mm SL, India 303 



235. i4ro(/iroMs«e//atus, lateral view of entire specimen, 292 mm SL, India 304 



236. Arot/iron armi/te, lateral view of entire specimen, 61.3 mm SL, Australia 305 



237. Tetraodofimbu, lateral view of entire specimen, 47.7 mm SL, Congo 306 



238. Ephippion guttifer, lateral view of entire specimen, 108 mm SL, Guinea 306 



239. Che/onodon/ZuDJah/is, lateral view of entire specimen, 84.7 mm SL, Thailand 307 



240. Monotreta leiurus, lateral view of entire specimen, 61.5 mm SL, Thailand 308 



241. Choner/iinos modestus, lateral view of entire specimen, 31.0 mm SL, Borneo 308 



242. Xenopterus mzn'tus, lateral view of entire specimen, 143 mm SL, Bay of Bengal 309 



243. Carmotetraodon/orteti, lateral view of entire specimen, 35.9 mm SL, locality unknown 310 



244. Cant/iigaster am boinerasi's, lateral view of entire specimen, 80.3 mm SL, Hawaii 311 



