5. EXOcffiTiTs. . 289 



23. Exoccetus katoptron. 



Exoccetus speculio'er, Bleek. Ned. Tudschr. Xed. Lid. ix. p. 273 (not 



C.^-V.). ^ ^ 

 katoptron, Bleek. Ned. Tydschr. Dierl. ii. p. T15. 



D. 13. A. 11. L. Lit. 46. 



The height of the body is nearly one-sixth of the total length 

 (without caudal), the length of the head one-fourth. The depth of 

 the head equals the distance between the extremity of the snout and 

 the hind margin of the orbit. Snout of moderate length, two-thirds 

 of the diameter of the eye, which is two-sevenths of the length of 

 the head and rather less than the width of the interorbital space, 

 which is slightly concave. The pectoral fin extends to the end of the 

 dorsal and anal. Ventral fin midway between centre of the eye and 

 root of the caudal. The dorsal commences far before the anal. There 

 are twenty-eight scales between the occijjut and the origin of the 

 dorsal, and seven longitudinal series of scales between the origin of 

 the dorsal and the lateral line. Pectoral with an oblique white band. 



Sumatra. 



a. Type of the species, 9 inches long. From Dr. Bleeker's Collection. 



24. Exoccetus robustus. 

 D. 14. A. 10. L. lat. 49. 



The height of the body is two-elevenths of the total length 

 (without caudal), the length of the head two-ninths. The depth of 

 the head equals the distance between the extremity of the snout 

 and the hind margin of the orbit. Snout a little produced, scarcely 

 equal in length to the diameter of the eye, which is two-sevenths of 

 the length of the head and less than the width of the interorbital 

 space, which is quite flat. The pectoral fin extends beyond the 

 dorsal and anal, nearly to the rudimentary rays of the caudal. 

 Ventral fins nearly midway between nostril and root of the caudal, 

 extending beyond the middle of the base of the anal. The dorsal 

 commences far in advance of the anal ; its anterior rays are not quite 

 half as long as the head. There are twenty-eight scales between 

 the occiput and the origin of the dorsal, and eight longitudinal series of 

 scales between the origin of the dorsal and the lateral line. Pec- 

 toral with a broadish oblique whitish band across its anterior half, 

 and wth a whitish margin. Ventral white, the middle rays greyish. 



Australia. 

 a. Sixteen inches long. Presented by Sir J. Richardson. 



25. Exoccetus arcticeps. 



D. 11. A. 8. L. lat. 49. 



The height of the body is two-elevenths of the total length (with- 

 out caudal), the length of the head a little less than one-fourth. 

 The depth of the head is a little less than the distance between the 

 extremity of the snout and the hind margin of the orbit. Snout 



VOL. VI. V 



