430 Dr. R. Pliilippi on the River-Fishes of Chili. 



f. i), the figure not being referred to in the text. However, 

 these two representations exhibit striking differences at the very 

 first glance. First of all, both lobes of the caudal are represented 

 by Cuvier and Valenciennes as very pointed, whereas Gay makes 

 them rounded as in all other Chilian species of Arius known to 

 me. But since in Cuv. and Val. it is evident, from the 

 relative position of the rays, that the upper half of the fin is 

 represented as the lower, I attribute these discrepancies to an 

 error of the draughtsman. Thus the ventral fin is represented 

 by Cuvier as considerably shorter than it is made to appear by 

 Gay ; the anal is also much shorter, and the breadth attained 

 by the adipose fin is much greater in Cuvier's figure; it is, in 

 fact, equal to the space between the first dorsal and the adipose, 

 while this space is represented by Gay as once and a half as great 

 as the length of the base of the adipose fin. 



According to Cuvier and Valenciennes the coloration is greyish, 

 with somewhat of green on the back, and, as the figure shows, 

 without any spots ; whereas Gay describes it as brownish, with 

 green spots on the back, and his figure represents, in fact, the 

 entire fish varied with brown spots, the back brown, sides green, 

 belly grey, all these colours subsiding one into the other. It is 

 characteristic of A. papillosus to have the palatine teeth obtuse 

 and almost granular (dents mousses et comme grenues). I 

 have seen this character of the teeth in no other Arius. 



3. Aimts carcharias, Leyb. 



In the year 1859, Fr. Leybold described a second species in 

 the 'Anales de la Universidad de Chile,' p. 1083, under the 

 above name, and presented the specimen which had served 

 him for the description to the Museum. The plate of the same 

 referred to by him in the text has not yet been published. His 

 description runs : — 



A. corpore brevi, regionem pectoralem versus lato, depresso, 

 postice compresso, elongate ; eapite oranino nudo, depresso ; 

 rostro prominente, triangulato-acuminato, obtusiusculo ; maxilla 

 superiore et iiiferiore, membrana branchiostega et isthmo papil- 

 losis ; cirrhis tantum duobus, crassis ; cute undique moUi ; oculis 

 parvis, ovalibus, supremis ; pectoralibus rhomboideis, undique 

 inermibus ; ventralibus rotundato-truncatis ; dorsali et anali an- 

 gustatis, truncatis ; caudal i furcata ; linea lateral i recta ; dorso 

 lateribusqne griseis, abdomine albo. 



I now quote from the Spanish description: — "The nasal 

 apertures are large, placed very near to each other, and sur- 

 rounded, and at the same time separated, by a lamellar fleshy 

 membrane. The pectoral fins are entirely without teeth . . . .; 

 the adipose fin is lanceolate. D. I . 8; P. 1 . 8; V. 6; C. 20.'' 



