59. ARIUS. 



161 



39. Arius leptonotacanthus. 



Anus leptonotacanthus, Bleek. Verh. Bat. Gen. xxii. Madura, p. 



and Atl. Ichth. Silur. p. 32. tab. 54. fig. 2. 

 Cephalocassis leptonotacanthus, Bleek. Prodr. Silur. p. 105. 



D. 1/7. A. 20. P. 



11, 



1/7. A. 20. P. 1/11. 



The height of the body is contained four times and two-fifths in 

 the total length (without caudal), the length of the head three times ; 

 head broader than high, its greatest width being contained once and 

 two-fifths in its length. The diameter of the eye is one-sixth of the 

 length of the head, and two-sevenths of the width of the interorbital 

 space. The occipital process is triangular, shorter than broad, ele- 

 vated along the middle ; the basal bone of the dorsal spine small. 

 Snout twice as long, as the eye. The teeth on the 

 palate are villiform, and form two separate elongate 

 patches, slightly bent, narrow, and not much shorter 

 than the eye, somewhat convergent posteriorly. 

 The maxillary barbels extend to the base of the 

 pectoral, the outer ones of the mandible to the gill- 

 opening. Lateral line bifurcate at the base of the caudal fin. The 

 soft dorsal fin as high as the body, with its spine rather slender, two- 

 thirds as long as the head, and serrated posteriorly. Adipose fin much 

 shorter than the dorsal. Pectoral fins two-thirds as long as the head ; 

 their spine is stronger, but little shorter than that of the dorsal fin. 

 Caudal with the lobes pointed, its length being two-elevenths or one- 

 sixth of the total. Fins yellowish. 



Madura. 



a. Type of the species. From Dr. P. v. Bleeker's Collection. 



40. Arius melanochir. 



Arius melanochir, Bleek. Nat. Tydschr. Nederl. Ind. iii. p. 590. 

 Cephalocassis melanochir, Bleek. Prodr. Silur. p. 103, and Atl. Ichth. 

 Silur. p. 30. tab. 52. 



B. 6. D. 1/7. A. 18. P. 1/12. 



The height of the body is contained four times and two-thirds in 

 the total length (without caudal), the length of 

 the head four times or four times and a half; the 

 height and the width of the head are contained 

 once and a third or once and two-fifths in its length. 

 The diameter of the eye is one-seventh or one- 

 eighth of the length of the head, and two-fifths or 

 one-third of the width of the interorbital space. 

 The fonticulus on the upper side of the head is 

 much dilated behind, heart-shaped; there is 

 another ovate groove on each side of this dila- 

 tation. The occipital process is narrow ; the basal 

 bone of the dorsal spine small. Snout twice or 

 thrice as long as the eye. The maxillary barbels extend somewhat 



vol. v. w 



