ABDOMINAL MALACOrTERYGIA NS. 195 



Others have a range of teeth in each jaw, which are trenchant, directed 

 obliquely forwards, the anterior ones longest, and, in a word, comparable 

 to those of a Balistes*. From the rivers of South America. 



Anostomus, Cxiv., 



Have the form of a Thymallus, and an upper and lower range of small 

 teeth ; the lower jaw turned up in front of the upper one, and gibbous, 

 so that the little mouth resembles a vertical slit on the end of the snout -|-. 



Gasteropelecus, Bl. — Serpes, Lacep., 



Have the mouth directed upwards as in Anostomus; but the belly is com- 

 pressed, projecting, and trenchant, owing to its being supported by ribs 

 which terminate in the sternum ; ventrals very small and far back ; first 

 dorsal over the anal, which is long; conical teeth in the upper jaw, trench- 

 ant and dentated ones in the other %. 



PiABUcus, Cuv., 



With the small head and slightly -cleft mouth of the Curimatas have a 

 compressed body, the ventral carina trenchant but entire, and a very long 

 anal. The first dorsal is opposite to the commencement of the latter §. 

 The 



Serra-salmus, Lacep., 



Already distinguished by that naturalist, is known by the compressed, 

 high body, and the trenchant and serrated belly, to which characters must 

 beadded that of the triangular, trenchant and dentated teeth. The max- 

 illary, wholly without teeth, passes obliquely over the commissure. There 

 is frequently a horizontal spine in front of the dorsal. 



The species known are all from the rivers of South America. It 

 is said that they pursue ducks, and even men, while bathing, inflict- 

 ing severe wounds with their sharp teet,hj|. 



Tetragonopterus, Artedi, 



Have the long anal, and trenchant, dentated teeth of the Serra-salmi, and 

 the maxillary without teeth passing obliquely over the commissure; the 

 mouth, however, is but slightly cleft, and the abdomen is neither carinated 

 nor dentated^. 



• Sulmo fasciaiu.i, Bl. 379;— 5. Fridericii, Id. 378. 



t Salmo anostomus, L., Gronov. VIII, 2. 



X Gastropelecus sternicla, Bl. 97, 3. 



§ Salmo argenthius, Bl. 382, 1; Marcgr. 170; — S. himaculatus, Bl. 16; — S.gibbosus, 

 Gronov., Mus. I, i. 4; — S. melanurus, Bl. 381, 2. 



II Salmo rhomboides, Bl. 383; — Serras. piraya, Cuv., Mem. Mus. V, pi. xxviii, f. 4; 

 — Serras. mento, Id , lb., f. 3; — Serras. aureus, Spix, XXIX; — S.nigricans, Id. XXX. 



^ Tetragonopterus argenteus, Arted., App. Seb. Ill, pi. xxxiv, f. 3, or Coregonoides 

 amboinensis, Art., Spec. 44, improperly confounded with the Salmo bimaculattis ; — 

 Clialceiis fusciatus, Cuv., Mem. Mus. V, pi. xxvi, f. 2; — Serra salmo chakeus, Spix, 

 XXXIII, 1. 



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