13. CRYPTOPTERUS. 39 



I. Anal separate from caudal. 



A. Maxillary and mandibulary barbels well developed, p. 39. 

 1. C. mononema. 2. C. limpok. 



B. Maxillary barbels well developed, mucb longer than the head ; man- 



dibulary barbels minute, if present, p. 40. 



3. C. amboinensis. 5. C. schilbeides. 7. C. macrocephalus. 



4. C. palembangensis. 6. C. bicirrhis. 8. C. lais. 



C. Maxillary barbels short ; mandibulary barbels short, if present (see 



C. hexapterus). 



a. Head and snout short, p. 42. 



9. C. micropus. 10. (J. micronema. 11. C. hexapterus. 



b. Head and snout longish, p. 43. 



12. C. micropogon. 13. C. bleekeri. 14. C. leptonema. 



II. Anal united with caudal : Pterocryptis, Peters, p. 44. 



15. C. gangeticus. 



I. Anal separate from caudal. 

 A. Maxillary and mandibulary barbels well developed. 



1. Cryptopterus mononema. 



Silurus mononema, Bleek, Verh. Bat. Genootsch. xxi., Nieuive Bydr. 



Silur. Java, p. 8. 

 Kryptopterus mononema, Bleek. Prodr. Silur. p. 287, and Atl. Ichth. 



Silur. p. 87. tab. 91. fig. 1. 



B. 10-11. D. 2. A. 76-79. P. 1/14. V. 8. 



The length of the head is contained seven times and two-fifths in 

 the total (without caudal) ; the diameter of the eye is one-fourth of 

 the length of the head. Nape of the neck slightly concave. Jaws 

 equal in length ; cleft of the mouth twice as broad as long. The 

 maxillary barbels extend to the second fourth of the anal those of 

 the mandibles to the base of the ventrals. Pectoral fin longer than 

 pectoral spine, nearly as long as the head ; the latter scarcely denti- 

 culated. Dorsal a little in advance of the ventrals. 



Java. 



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



2. Cryptopterus limpok. 



Silurus limpok, Bleek. Nat. Tydschr. Nederl. hid. iii. p. 583. 

 Kryptopterus limpok, Bleek. Prodr. Silur. p. 286, and Atl. Ichth. Silur. 

 p. 87. tab. 91. fig. 2. 



B. 11-12. D. 2. A. 76-88. P. 1/14. V. 8-9. 



The length of the head is contained six times and a half to six times 

 and four-fifths in the total (without caudal) ; the diameter of the eye 

 is one-third or two-sevenths of the length of the head. Nape of the 

 neck very concave. Cleft of trie mouth twice as broad as long. The 

 maxillary barbels extend to the posterior quarter of the anal, those 



