8 branched rays and the 4.^ simple ray ossified, slender, finely 

 serrated. Origin of dorsal slightly before that of ventrals. Anal 

 very short, with 5 branched rays, its spine weak. Caudal deeply 

 forked, its basal half covered with small scales. Scales of 

 moderate size. Lateral line running in the middle of the tail. 

 Pharyngeal teeth compressed, their masticatory surface longi- 

 tudinally grooved, 4.3.2 2.3.4. Gillopenings rather narrow, rea- 

 ching to hindborder of praeoperculum. 



Distribution: The single species only known from fresh 

 water of Sumatra and Borneo. 



i. Albulichthys albuloides (Blkr.). 



Systomus albuloides Bleeker, Nat. Tijdschr. Ned. Indie IX. 1855, p. 425. 

 Albulichthys albuloides Bleeker, Ichth. Arch. Ind. Prodr. II. Cyprini 1860, 



p. 306. Atl. Ichth. III. 1863, p. 114. 

 Albulichthys albuloides Gunther, Cat. Brit. Mus. VII. 1868, p. 160. 



5i 

 D. 4.8; A. 3.5; P. 1.16 18; V. 1.9; L.I. 38; L. tr. j_. 



5* 

 Height 3 4, nearly equal to the length of the head. Eye 



about 3 1 / 2 , a little longer than snout. Origin of dorsal oppo- 

 site to 9 th or io th scale of lateral line, separated by n 12 

 scales from occiput. Origin of anal opposite to 23^ scale of 

 lateral line. Pectorals and ventrals subequal ; origin of ventrals 

 separated by 3 ! / 2 scales from io th II th scale of lateral line. 

 Pectorals more than one and a half times in length of head. 

 Least height of caudal peduncle 1.4 in its own length, sur- 

 rounded by 16 scales. Silvery, back darkish. Length 360 mm. 

 [One of BLEEKER'S specimens in the Leiden Museum examined 

 by us]. 



Habitat: Sumatra (Palembang); Borneo (river Kapuas and 

 Kahajan). 



7. Mystacoleucus Gunther. 



(GUNTHER, Cat. Brit. Mus. VII. 1868, p. 206). 



Oblong, compressed, abdomen rounded. Dorsal fin short, 

 about opposite to origin of ventrals, with 8 9 branched rays 

 and an osseous spine, serrated behind and of moderate strength. 

 Anal of moderate length, with 8 9 branched rays. Scales of 

 moderate size, the nuchal ones beginning somewhat before 

 the vertical through the hindborder of the operculum. Lateral 

 line running along about the middle of the tail. Mouth small, 

 somewhat inferior, with the margin of the lower jaw obtuse, 



