112. PARIODON. 275 



111. EREMOPHILUS. 



Eremophilus, Humboldt, Observ. Zool. i. p. 17. 



Adipose fin none ; dorsal fin short, without pungent spine, placed 

 behind the middle of the body ; ventral fin none ; anal short, caudal 

 truncated. Teeth villiform, forming bands in the jaws ; palate tooth- 

 less. A pair of maxillary barbels on each side, a pair of slender nasal 

 barbels. Eyes small. Head covered with soft skin. Operculum and 

 interoperculum armed with patches of small osseous prickles. 



Andes. 



1. Eremophilus mutisii. 

 Humb. I. c. pi. 6 ; Cuv. $ Vol. xviii. p. 500. pi. 553. 

 B. 8. D. 11. A. 9. P. 9. 



The length of the head is contained six times and a third in the 

 total. Yellowish, with reticulated brown lines and dots. 

 Bogota. 



112. PARIODON. 



Pareiodon, Kner, Sitzgsber. Wien. Acad. 1855, xvii. p. 161. 

 Centrophorus, Kner, Denkschr. Acad. Wiss. Wien, 18o9, xvii. p. 167 * 

 Astemomycterus, Guichen. in Rev. et Mag. Zool. 1860, xii. p. 525. 



Adipose fin none. Dorsal fin short, without pungent spine, placed 

 behind the middle of the body and behind the ventral fins ; anal 

 short ; caudal forked. Jaws with a single series of flat, truncated 

 incisors ; palate toothless ; cleft of the mouth rather narrow, with a 

 pair of maxillary barbels on each side ; no other barbels. Eyes very 

 small. Head covered with soft skin ; operculum and interoperculum 

 armed with a stripe of small osseous prickles. Gill-openings rather 

 narrow, only a narrow fold of the gill-membranes running across the 

 throat. Ventrals five-rayed, inserted behind the middle of the body. 



Brazil. 



1. Pariodon microps. 



Pareiodon microps, Kner, I. c. c. fig. 



Trichomycterus pusillus, Casteln. Anim. nouv. Atner. Sud, Poiss. p. 50. 

 pi. 24. fig. 4 (bad). 



D. 9. A. 7. P. 6. 



Body elongate, its height being about one-eighth of the total length 

 (without caudal). Barbels short. Coloration uniform. 

 Araguay, River Amazons. 



* Dr. Kner proposes this second name, because he considers the first, Pariodon, 

 as preoccupied by Valenciennes's genus of Characinoids, Parodon : both names, as 

 he thinks, being composed of irapeia, cheek, and oSoiis. We need hardly remark 

 that this is incorrect, the name given by Valenciennes being derived from irapa. 

 The similarity of the two names is great, but it does not appear to justify an altera- 

 tion ; and the second name proposed by Dr. Kner is altogether inadmissible, 

 because this is really preoccupied. 



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