53 



Genus Acrochordoxichthys Bleeker. 



SYNONYMY. 



Acrochordonichthys Bleeker, Ichthyologise Archipelagi Indici Pro- 

 dromus, vol. i. Siluri, p. 209, 221. 



Internal and external inframaxillary barbels distant from each other ; 

 the former situated near the front of the jaw ; the latter far behind the 

 angle of the mouth. Branchial apertures inferior ; branchiostegal 

 membrane moderately emarginated ; branchiostegal rays seven. 

 Caudal fin entire. Skin of the body covered with longitudinal rows 

 of warts. Supramaxillary barbels, membranaceous at their bases. 



Five species of this genus have been described by Bleeker, all of 

 which are peculiar to the rivers of Sumatra and Java. 



Type Acrochordonichthys platycephalus Bleeker. 



Genus Akysis Bleeker. 



SYNONYMY. 



Akysis Bleeker, Ichthyologise Archipelagi Indici Prodromus, vol. i. 

 Siluri, pp. 209, 234. 



All the inframaxillary barbels approximated to the front of the 

 mouth. Branchial apertures posterior, produced beyond or behind 

 the apex of the opercula ; branchiostegal membrane scarcely or not 

 at all emarginated. Branchiostegal rays six. Caudal fin bilobed. 

 Skin of the body granular. 



If the Pimelodus cana of Hamilton Buchanan really belongs to this 

 genus, two species are known, one of which is found in the rivers of 

 Java, and the other in Bengal. 



Type Akysis variegatus Bleeker. 



Group Glyptosterni Gill. 



Head covered by the skin. Nostrils contiguous and patulous, 

 neither tubular nor valvular. Teeth small, acute, and pluriserial, in 

 a single or transversely divided band on each jaw. Branchial aper- 

 tures posterior, extending as far as the apex of the opercula ; bran- 

 chiostegal membrane very deeply emarginated. Branchiostegal 

 rays eight or nine. 



Skin of the body smooth, Thoraco-postgular region with transverse, 

 concentric, or posteriorly converging suctorial laminae. 



Anal fin of moderate length, with ten to fourteen rays. Dorsal 

 pectoral spines cartilaginous or osseous, enveloped in the skin. Caudal 

 fin bilobed. Ventral fin with one simple and five branched rays. 



Natatory bladder absent. 



Genus Glyptosternum McClelland. 

 synonymy. 

 Glyptosternon McClelland, Calcutta Journal of Natural History, 

 vol. II. 



