163 



DORAS. 



half as in tlie figure of Spix , and the tail appears 

 to have been nearly square. 



The formula of the fins, in Spix and Yalenciennes, 

 agree nearly; in our notes, we regret they have 

 been omitted. {]. ) Doi^as ni^er,Y alenc. ; (2.) D. 

 Humloldtii^ A gas. 



(1.) B.8.— D. 1/6_P. 1/1 0—A.ll_V. 7— C. 17— Cost.pl. 24. 

 (2) 16/6 



" D. Niger, Valeric. — (Ore edentulo). Corpore nudo lacvi, 

 seutellis trigonis in utroque latere 24. Caput magnum 

 elongatum, antic e acutum, clypeatum. Labia crassa, 

 eirrosa. Cirri sex, duo ad rictum ; quator aequalcs 

 brevisslmi, in maxilla inferiore. Scutella lateralia, quo- 

 rum priora quatuor, inermia, csetera triangularia, acu- 

 leata. Pinna adiposa porrecta, angustata."'f' 



Regarding another doubtful species, Mr. Schom- 

 burgk says : — " The following account of a species 

 of Doras, or one of the Callychthidae, has been 

 politely furnished to me by Dr. Hancock, who, 

 himself a long resident in Gaiana, made several 

 excursions into the interior, and accompanied, in 

 1810 and 1811, an expedition which the colonial 

 government of British Guiana dispatched at that 

 period into the interior with a view to inquire into 

 the feuds of the natives. 



" Mailed Fish caught at the OrooporarT/X^ Dec. 26, 

 1811. — Amongst these falls, in a very shallow rapid, 

 one of our Carib guides caught a singular fish, 



f Humboldt, Zool. Researches, ii. p. 184. 

 X A cataract on the river Essequibo, in about 4 deg. 38 min. 

 north latitude. 



