13. CRYPTOPTERUS. 43 



10. Cryptopterus micronema. 



Silurus micronemus, Bleek. Verh. Bat. Gen. xxi., Silur. Butav. p. 18. 



phalacronotus, Bleek. Nat. Tydschr. Nederl. Lid. ii. p. 429. 



Micronema typus, Bleek. Prodr. Silur. p. 300, and All. Ichth. Silur. 



p. 91. tab. 92. fig. 2, tab. 93. fig. 1. 

 Phalacronotus micruropterns, Bleek. Prodr. Silur. p. 307. 

 Micronema phalacronotus, Bleek. Enumer. p. 139. 



B. 14. A. 85-93. P. 1/12-14. V. 9. 



The height of the body is contained four times and a half in the 

 total length (without caudal), the length of the head five times and 

 two-thirds ; the diameter of the eye is one-fifth of the latter. Nape 

 of the neck concave. Lower jaw slightly prominent ; the vomerine 

 band occupies the whole width of the palate. The maxillary barbels 

 extend to the eye, those of the lower jaw are minute. Pectorals not 

 much shorter than the head, with the spine slightly denticulated. 



Java, Sumatra, and Borneo. 



a, b, c. Types of the species. From Dr. P. v. Bleeker's Collection. 



11. Cryptopterus hexapterus. 



Silurus hexapterus, Bleek. Nat. Tydschr. Nederl. Ind. ii. p. 203. 

 Micronema hexapterus, Bleek. Prodr. Silur. p. 301, and Atl. Ichth. Silur. 

 p. 91. tab. 92. fig. 1. 



B. 12-13. A. 74-83. P. 1/16-17. V. 8. 



The height of the body is contained five times and three-fourths to 

 five times and a third in the total length (without caudal), the length 

 of the head six times and a half to seven times and a fifth ; the nape 

 of the neck concave ; the diameter of the eye is one-fifth or one-sixth 

 of the latter. Lower jaw strongly prominent ; vomerine band short. 

 The maxillary and mandibulary barbels are sometimes shorter, some- 

 times rather longer than the head. Pectoral rather longer than the 

 head, with the spine short and not denticulated. 



Java, Sumatra, and Borneo. 



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



b. Head and snout longish. 



12. Cryptopterus micropogon. 



Silurus apogon, Bleek. Nat. Tydschr. Nederl. Ind. ii. p. G7. 

 Phalacronotus micropogon, Bleek. Prodr. Silur. p. 306, and Atl. Ichth. 

 Silur. p. 92. tab. 94. fig. 1. 



B. 14-17. A. 78-91. P. 1/14-15. V. 9-10. 

 Only one pair of barbels, extending to the eye. The height of the 

 body is contained six times and a third or seven times in the total 

 length (without caudal), the length of the head four times and three- 

 fifths to five times and a third ; the depth of the head is less than one- 

 half of its length; the diameter of the eye is one-fourth or one-sixth 

 of the length of the head. Lower jaw prominent. Pectorals shorter 



