ARIUS BLEEKEUI. 73 



behind, the spine has a soft prolongation, the distance 

 from the first dorsal to the end of the snout is contained 

 3i in the total length with the caudal ; the dorsal adipose 

 fin is in its total length 1^ longer than the length of its 

 base and the height is ^ of the length of the base, the 

 distance to the first dorsal is nearly 5 times the length of 

 its base, the end is obliquely rounded; the pectoral fins 

 are pointed, the spine is not strong, either not or a little 

 shorter than the dorsal spine, on the sides striated, ante- 

 riorly in the lower part granulated, in the upper part 

 serrated, posteriorly a small lower part smooth, the other 

 greater upper part serrated, the spine has a soft prolon- 

 gation 5 the axillary pore is small ; the ventral fins are 

 obliquely rounded at the end, reaching the anal fin, shorter 

 than the pectorals; the anal fin is anteriorly rounded, in 

 the latter half of the upper margin a little emarginated, 

 its base is more than twice as long as the base of the 

 adipose dorsal fin, the height is about I of the length of 

 its base; the caudal fin is deeply forked, the upper lobe 

 is longer and more pointed than the under lobe, 4| in the 

 total length with caudal; the colour of the body is in 

 spirits on the upper side violet-brown, on the lower side 

 white, all the fins are brownish, the adipose dorsal without 

 a black spot. 



B 6, D 1/7, P 1/9, V 1/5, A 8/16 or 9/15, C 1/13/1 with 

 short laterals. The length of the four specimens is varying 

 between 148 and 170 mM. 



The relation of this new species with Arius macrono- 

 tacanthus Blkr. is as follows : the height of the head of 

 both is 1 2 times in its length ; the upper surface of their 

 head and their occipital process are much granulated ; the 

 basal bone of their dorsal spine is small; they have both 

 two patches of teeth on the palate, these are convergent 

 before and much divergent behind, longer than broad, the 

 length parallel to the maxillary teeth ; the teeth of their 

 dorsal spine are directed downwards; their adipose fin is 

 of average size, much shorter than the anal. 



JNotes from the Leyden IMuseuin, "Vol. XXH. 



