430 ADDENDA. 



and a very small slit {porus axillaris) in the axil of the pectoral 

 fin ; the presence of this porus has been denied by Dr. Bleeker, 

 but he has probably overlooked it. Therefore it seems that 

 Onjptoptervs bicirrhis of Bleeker is identical with my Cr. am- 

 boinensis, but it remains doubtful 'whether it is also identical 

 with the fish described by Valenciennes. 



Page 41. Cryptopterus scMlbeides. 

 6. Another specimen from Dr. Bleeker "s CoUectiou. 



Page 42. Cryptopterus micropus. 

 I: Another specimen from Dr. Blocker's Collection. 



Page 72. Add a new species : — 

 3 a. Chrysichthys furcatus. 



D. 1/6. A. 13. P. 1/9. V. 6. 

 The height of the body is one-sixth of the total length (without 

 caudal), the length of the head rather more than one-fourth ; head 

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

 two-fifths in its length ; its upper surface is covered with a thin skin ; 

 occipital process longer than the basal bone of the dorsal spine, both 

 meeting behind the middle of the nape. Snout broad, but scarcely 

 depressed, its length being more than one-third of the length of the 

 head ; upper jaw rather longer than the lower. Nasal barbels very 

 smaU ; the barbels of the maxillary extend to the end of the head, 

 the outer ones of the mandible to the giU-opening. The teeth on 

 the palate form two long and straight bands, convergent in front, 

 narrowest in the middle and cuneiform at the extremities. The 

 width of the bony portion of the interorbital space is rather more 

 than the longitudinal diameter of the eye, which is one-fifth of the 

 length of the head, and one-half of that of the snout. Dorsal fin 

 elevated ; its longest rays are one-fourth longer than the spine, which 

 is as long as the head without snout, and finely serrated behind. 

 Adipose fin shorter than, and very remote from, the dorsal ; anal 

 rather high, its longest ray being as long as the dorsal spine. Caudal 

 fin large, deeply forked, the upper lobe being the longer. Pectoral 

 spine stronger, but shorter, than that of the dorsal, with strong re- 

 curved spines along its inner margin. Ventral shorter than pectoral, 

 not extending to the anal. Uniform brownish above, whitish below. 



West Africa. 

 a. Fifteen inches long. Purchased of Mr. Dalton. 



Page 73. Chrysichthys nigrodigitatus. 



Add to the diagnosis : — 

 The diameter of the eye is contained once and three-fifths in the 

 extent of the snout (in a specimen 16 inches long). The length of 

 the dorsal spine is two-thirds, or rather more than two-thirds, of that 

 of the head, and more than that of the pectoral. 



