40 siLURiaa:. 



of the mandibles far beyond its origin. Pectoral fin longer, pectoral 

 spine rather shorter than the head ; the latter strong, denticulated 

 interiorly. Dorsal above the ventrals. 

 Sumatra and Borneo. 



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



This species appears to have the place behind the head, where the 

 air-bladder is seen through the transparent skin, of a dark colour 

 during life. 



B. Maxillary barbels well developed ; mandibulary barbels minute, 

 if present. 



3. Cryptopterus amboinensis. 

 D. 1. A. 63. P. 1/10. V. 6. 



The height of the body is contained nearly five times in the total 

 length (without caudal), the length of the head six times and a half. 

 Nape of the neck not elevated. The single rudiment of a dorsal fin 

 is situated a little before the vertical from the base of the ventral. 

 The eye is situated near to the lower profile of the head, and its 

 diameter is one-third of the length of the head. Cleft of the mouth 

 twice as broad as long. The maxillary barbels extend to the end of 

 the pectoral; mandibulary barbels minute. The pectoral is much 

 longer than the head, and extends to the seventh anal ray ; its spine 

 is rather shorter than the head, and distinctly denticulated along its 

 inner edge ; ventral very short, as long as the eye. Caudal forked to 

 its base, each lobe nearly as long as the pectoral. A minute porus 

 axillaris. Coloration uniform ; sides silvery. 



Amboyna. 



a. Fine specimen, 4^ inches long. Amboyna. Purchased of Mr. 

 Stevens. 



4. Cryptopterus palembangensis. 



Silurus palembangensis, Bleek. Nat. Tydschr. Nederl. Ind, iii. p. 684. 

 Krvptopterichthys palembangensis, Bleek. Prodr. Silur. p. 290, and^4£/. 

 Ichth. Silur. p. 88. tab. 90. fig. 3. 



B. 8-9. D. 1-2. A. 61-70. P. 1/11-12. V. 6. 



The height of the body is contained from thrice and a third to thrice 

 and three-quarters in the total length (without caudal), the length of 

 the head from five times and two-thirds to six times. The rudiment 

 of a dorsal fin is situated above the base of the ventral. Nape of the 

 neck slightly concave. The eye is situated near to the lower profile 

 of the liead, and its diameter is one-third of the length of the head. 

 Cleft of the mouth twice as broad as long, with the jaws equal in front. 

 Vomerine teeth in a short, uninterrupted band. The maxillary barbels 

 extend nearly to, or somewhat beyond, the end of the pectoral. The 

 mandibulary barbels are so minute, that they can only be detected with 

 the utmost caution. The pectoral is much longer than the head, its 

 length being one-fourth of the total (without caudal) ; it extends to 

 the thirteenth anal ray ; its spine is not shorter than the head, and 



