SYNOPSIS. 411 



posite ; pectorals pretty large ; caudal nearly even at the 

 extremity ; the inflatable portion of the underside of the 

 body armed with small sharp spines, springing from a 

 stellated root ; colour of the back rich blue, belly and 

 sides silvery white : fins, brown. — Yarr. Brit. Fish., ii« 

 p. 547. Tetradon stellatus, Don. Brit. Fish., pi. 66 ; 

 Jenyns' Brit. Vert., 489. T. lagocephalus, Perm. Brit. 

 Zool., iii. p. 1 74, pi. 23. 

 Gen. CI. Orthagoriscus. Jaws not divided by a suture ; 



body short, excessively deep, truncated behind; dorsal and 



anal fins united to the caudal. 



Sp. 211. 0. mola. Short Sun-fish. Depth about two- thirds 

 of the length, form approaching to orbicular ; sides much 

 compressed; pectoral fin rounded; dorsal and anal fins 

 very long and pointed ; caudal with the hinder margin 

 rounded, its depth equal to that of the body ; head not 

 distinguishable from the trunk ; surface of the body rough 

 with small granulations ; colour of the back dusky grey, 

 occasionally with a bluish tinge ; belly and sides silvery. 

 — Cuv. Reg. An.; Jenyns' Brit. Vert., p. 490; Yarr. Brit. 

 Fish., ii. p. 462. Tetradon mola, Penn. Brit. Zool., iii. 

 ,p. 172, pi. 22. 

 Sp. 212. 0. oblongus. Oblong Sun-fish. Length more than 

 twice the depth of the body, the skin hard and divided 

 into minute angular compartments ; pectoral rather long 

 and pointed ; dorsal, caudal, and anal nearly in a line ; 

 colour dusky above, silvery beneath. — Cuv. Reg. An. ; 

 Yarr. Brit. Fish., ii. 469. Tetrodon truncatus, Penn, 

 Brit. Zool. iii. p. 170, pi. 22; Don. Brit. Fish., pi. 41 

 Cephalus oblongus, Swainson, Cab. Cyc, Hist, of Fishes^ 

 u. p. 329. 

 Fam. XXV. Balistidcs. Fam. of File-fish. Body compressed^ 



oval-fusiform, head much produced, conical; teeth distinct, and 



existing in both jaws ; skin granulated, or clothed witth large 



scales. 



Gen. CII. Balistes. Body covered with large rhomboidal 



plates imbedded in the skin ; teeth eight, forming a single row 



