^EW SPECIES OF FXSHBS [Septenji^ea^ 



vSmall subglobiilar air vessels, placed each in a 

 cavity, under, and on each side of, the cavity of 



^ the cranium.^ 



Fins: a single dofsal, placed opposite to the commence- 

 ment of the anal ; pectorals placed low, near the 

 bpercula, ventrals midway between the pectorals 



^ . and anal. 



Scales large, pellucid at tho edges, easily deciduous. 



SPECIES. 



i. HroBON ter^isus* Anal-fin large, and rounded 

 ViJa its anterior part, very narrow on its posterior part, 

 fiotchcd in the middle. 



Btdy lenr^thened, elevate^d^^ back almost straight^ 

 4Tid parallel Avith the abdoinen ; tail narrow; dor- 

 ^^al-fin subqiTadrangiiiar, elevated on its anterior 

 *^i>arf, tJre tliiee first rays simple, the last double^ 

 the mten1i(idiate ones divided 5 fectorals falciform, 

 pol^nl, placed horizdhtally in a longitudinal de- 

 pression ; veiilfals l?trge, somewhat routided at their 

 pciiits, and furnished Avith a squamiform appendix at 

 their base ; anal-fin long, v/ith pretty strong divided 

 rays, the ^st dotible, the three first simple ; caudal^ 

 ■Jmfov^:^, lobes pointed,, equal ; latevcl4ine slightly 

 Lirchcd towrirds th^. back. 



This pp'-^cies I bbserved in Lake Erie, at Bufi'alo ; 

 ViM Mr. T, Say examined an individual of the same on 

 ihe OMo, D.i Pittsburg. The colour of its giU-oovers is 



* These t\v'6 small air vessels appear to enable the £sli to rise with facility 

 ^o the sui-fice of the water, to take its prey. Time clicl not- per.r.it me to ob- 

 r ;rve 'whctlier there is a commuTiiciitlon bct\vecn them and the air-fol?-<i<ler 



