T. LATtS. 241 



rimi, at the cataracts of the Paramu, a tributary of 

 the Orinoco which joins that river above Esmeralda ; 

 it was of almost a black colour, and the size of the 

 common pacu. Although we saw them in numbers 

 feeding on the herbs at the rocks, we did not suc- 

 ceed in securing more than one, which the Indians 

 had cut up before I could inspect it." 



D. 22_P. 15_V. 9— A. 43— C. 26_Br. 4— Vert. 36. 



TETRAGONOPTERUS. 



** TETRAGONOPTERUS, Cuv — Caput minimum, lateraliter 

 compressum. Oculi maximi, laterales. Os sat magnum, 

 apertum quadratum ; mandibula prominens. Dentes 

 magni cuspidati, apice serrati in mandibulsc parte an- 

 teriore, et in duabus seriebus in latis oss'.bus inter- 

 maxillaribus totum marginem supcriorem oris confor- 

 mantibus ; ossa maxillaria superiora parva rttrorsum 

 subarcuata, lateralia, dentibus minutissimus, ut in parte 

 posteriore ramarum mandibulse, armata. Lingua apice 

 libera. Membrana branchiostega radiis 4 latis. Corpus 

 squamis magnis tectum, compressissimum, latissimum. 

 Pinnas mediocres, analis latissima." 



Two drawings appear to range in the above 

 group, and neither of th(MTi do we find any where 

 described, particularly the beautifully marked spe- 

 cies which we have dedicated to our traveller. 



T. LATus, Broad -SHAPED Tetragonopterus. — 

 Arawaak, Cartaback ; L. Geral, Pacu.* Schomb. 

 Draicings^ No. 29. — This fish is nearly as broad as 



* The name Pacu^ in the L. Geral, is common to the form. 



