72 ARIUS BLEEKERI. 



lated, granules fine, partly in lines; the longitudinal me- 

 dian groove is 5 times longer than its greatest width, in 

 its posterior half is a round cavity and it ends posteriorly 

 in a narrow point, which does not reach the occipital 

 process ; the occipital process is as long as it is wide at 

 its base and it is but slightly keeled ; the basal bone of 

 the dorsal spine is small, crescent shaped with some gra- 

 nules; the opercula are smooth, veined; the scapula is 

 pointed, rough ; the nostrils are nearer to the mouth than 

 to the eyes, placed close together, the anterior ones are round, 

 the posterior ones oval with a valve ; the maxillary barbels 

 reach the end of the pectoral spines, the outer mandibular 

 pair reach as far as the posterior point of the scapular bone, 

 the interraaudibular pair reach a little beyond the gill- 

 opening ; the length of the snout, measuring to the anterior 

 border of the eye, is 11 times the length of the eye; the 

 snout is projecting beyond the cleft of the mouth ; cleft 

 of the mouth crescent shaped, not reaching the anterior 

 border of the eye; the teeth in the jaws are villiform, in 

 bands ; teeth on the palate villiform, in two oval patches, 

 which are long |. of the length of the eye, the distance 

 between the patches is about equal to the breadth of the 

 patches, and this breadth is the half of their length, they 

 are very divergent posteriorly, the length parallel to the 

 maxillary teeth ; the lateral line is very conspicuous, almost 

 not ramificated, and where a slight ramification is to be 

 seen, it is very short and scarcely visible; anteriorly the 

 lateral line is descending, in the middle and posteriorly 

 it is straight, at the base it is not bifurcated, but directed 

 upwards; the dorsal lateral pores, hardly visible without a 

 lens, are in simple transverse parallel series; the first dorsal 

 fin is rayed, pointed, 3 times higher than the length of 

 the base, the spine is not strong, 1 to IJ in the length 

 of the head, on the sides striated, anteriorly it is granu- 

 lated in the lower part, serrated in the upper part, poste- 

 riorly it is nearly smooth in the lower part, serrated in 

 the upper part, the teeth directed downwards before and 



Notes from the Leydeii IMuseum, ^'ol. XXII. 



