SYNOPSIS. 41 1 



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, Dm. Bi*it. Fish., pi. 66 ; 

 Jenyns* Brit. Vert., 489. T. lagocephalus, Penn. Brit. 

 Zool, iii. p. 174, pi. 23. 

 GEN. CI. OuTriAGORiscus. 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 marg'n 

 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 tin.ue ; belly and sides silvery. 

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

 Fish., ii. p 462. Tetradon mola, Perm. 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. Biit. Fish., pi. 41 

 Cephalus oblongus, Swainson, Cab. Cyc., Hist, oj Fishes, 

 ii p. 329. 

 F AM. 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 



