EIGENMANN: the freshwater fishes of BRITISH GUIANA 465 



Mugil brasiUensis (not of Agassiz) Gunther, Catalogue, III, 1861, 431.-Jordan 



and Gilbert, Synopsis Fishes North America, 1883, 403. 



Several specimens, the largest 238 mm. Georgetown market. (C. M. Gat. 

 No. 1472a-c; I. U. Cat. No. 12399.) 



Order PERCOMORPHI. 



Key to the Families of Percomorphi. 



a. Lateral line continued on the tail. Scisnidae, XXL 



b. Anal spines 2; caudal pointed '. . , Centropomidae, XXIL 



bb. Anal spines 3; caudal forked 



aa. Lateral Une if present not continued on the tail. 



c. Dorsal spines strong, the spinous dorsal continuous with the soft dorsal 



d. Nostrils single; lower pharyngeals united. Lateral Une interrupted near the c.d^of^Uie sp^ous 



M. Nostrit!i;ieV lower' phalangeals sepa;ate.' ' No la;eral line.. ^^'X^^.^^y 



cc. Dorsalspinesweak,thespinousdorsalnotcontinuouswiththesoftdorsal Gobud., XA • 



Family XXL SCI^NID^. 



Key to the Genera of Sci^nid^.'" 

 a Teeth not villiforni; lower ]aw proniinent; edge of the preopercle entire; second anal spine weak, adnate to 

 the first ray, the first spine minute or obsolete. {Otohth,n<e.) Cynoscion. 



what enlarged and lance-shaped • ' c^,v,.„;««. ) 



aa. Second anal spine usually well-developed and ioined to the first ray by a distinct membrane. iSa.n.n., 



'■ T;!:o;lt"h'::ttth or serrations, its membranaceous mar.n entire, crenulate or ciliate 



M excessively cavernous, soft and spongy to the touch; interorbital space very broad 

 mouth Jge and obU.ue; teeth subequal, all villiform, in narrow bands; low. .aw 



. Skull r::::ee2:"cr!::i—^ 



''■ '"" Trht: lufor; but more or less unequal, those of the u.^er Jaw ^-n. ^^^^^^^^^^ 

 series somewhat enlarged. Scales of the lateral line considerably enlarged, almost 

 elTely concealed by smaller ones. Pseudobranchi. smaU, often obsolete o^^o^e^s.d. 



M Preopercle armed with sharp teeth or serr.. Head very broad; interorbital ^P-e Aattish and 

 'very cavernous. Soft dorsal and anal fins densely scaled. Second anal spine stou.^^^^ 



cc Lower jaw with barbels. Lower jaw included, its teeth villiform, in bands. 

 /. " PseudobrancUa; well-developed, pectoral fin not elongate.' 



^ ,. Barbels three, slender, and at the symphysisof the lower jaw; --* ^^ "^;"'^;'^;;°;; ^ fe 

 orbital turgid and cavernous, somewhat translucent; caudal fin rhombic. ^Preo^ercle 



finely serrate 



»This account of the Sci^nid^ wa^ prepared by Mrs. Marion Durbin Ellis. 



