302 CUKOMIDES. 



extending to, or nearly to, the root of the caudal. The anal spines 

 are strong, two-sevenths of the length of the head. Caudal rounded, 

 its length being rather more than one-sixth of the total. The free 

 portion of the tail is longer than high. The pectoral extends to the 

 first anal spine, the ventral to the vent. The distance of the vent 

 from the ventral is nearly one-half of the length of the head. 

 Length of the largest specimen 16 inches. 



10. UARU. 



Uaru, Heckel, Brasil, Fluss-Fische, in Ann. Wien. Mus. ii. p. 330. 



Body compressed, elevated, covered with small ctenoid scales. 

 Dorsal spines numerous, anal spines eight. Base of the soft dorsal 

 scaly. Teeth awl-shaped, forming a series separate from the small 

 teeth behind. Anterior prominences of the first branchial arch short 

 horny bi- or tri-cuspid processes. Cleft of the mouth oblique, of 

 moderate width, and with the jaws equal anteriorly. Scales on the 

 cheek small, in numerous series. 



Brazil. 



1. Uaru amphiacanthoides. 



Heckel, Brasil. Fluss-Fische, p. 331. 



D. f. A.:^. L. lat. 42. L. transv. 11/?. 



14 14 ' 



Scales on the cheek in ten or eleven series. Light-brown : a large 

 elliptical or band-like spot extends from the root of the pectoral to 

 that of the caudal ; a black spot at the root of the caudal, another at 

 the base of the pectoral, and a third behind the eye. {Heck.) 



Eio Negro. 



2. Uaru obscurum. 



D. J|. A. f-^. L. lat. 50. L. transv. 13/26. 



Scales on the cheek in nine subhorizontal series. Blackish-brown ; 

 a black spot at the root of the caudal. 

 River Cupai. 



a. Six inches long. Eight hundred miles from the sea. Purchased 

 of Mr. Stevens. 



Description of the specimen. — The height of the body is two-thirds 

 of the total length (the caudal not included), the length of the head 

 nearly one-third. Head higher than long, with the upper profile 

 very oblique. Snout compressed, elevated, much longer than the eye, 

 with the jaws equal anteriorly and with the cleft of the mouth ob- 

 lique. The maxillary does not extend to below the anterior margin 

 of the eye. The front teeth of the jaws are rather long and slender, 

 of moderate strength, awl-shaped, with brown points ; they form a 

 single closely-set series, there being ten on each side of the upper 

 jaw, and eight on each side of the lower ; there is another single 

 series of smaller teeth behind the front series of the upper jaw, whilst 



