Claasification of the Order Os(ariophi/si. 



563 



Aki/fiis and Acrochordonichthys resemble them in tlicir air- 

 bladder and anterior vertebra^ {fide Bridj^e and H addon). 

 Tliere is a skeUton of Akys'is mujur, Bonleng., in the 

 British Museum collection, but unfortunately this is a species 



Fig. 1. 



A. B. C. 



A. Clnrias anr/uillarts. B. C'larotes Iceviceps. C. Liobayrus andersonii. 



Hyopalatine boues of the left side, seen from below, pal, palatine ; pt, 

 pterygoid; wK<t, mesopterygoid ; mt, metapl'^rygoid ; q, quadrate} 

 hm, hyomandibular ; pop, praeoperculum. 



of Glyptosternwn,vi\\\]%t Koschkaroff'sdescri])tion and figures 

 of the skeleton of Akysis are evidently based on a species of 

 Macrones or some related genus. 



Family 9. Sisoridae. 



Differ from the Bagridse in certain features of specializa- 

 tion, such as the aljsence of pterygoid and post-temporal, the 

 contraction of the head of the hyomandibular, \yhicli articu- 

 lates with the sphenotic only, and the division of the air- 

 bladder into two lateral sacs. Lower surface of h.ead and 

 abdomen flat and paired fins horizontal. Nostrils close 

 together, with a more or less developed barbel between 

 them. Gill-membranes free {Xatigra, Bagarius) or attached 

 to isthmus. Vertebr8e34 to40 (15-19 + 19-23) ; parapophysis 

 of the fourth vertebra a lamina which is decurved anteriorly, 

 forming a semicylinder ; parapophysis of the fifth vertebra 

 very strong, extending outwards to the skin, rarely uniting 

 with that of the fourth to form a complete cylinder, 



Asiatic fresh-water fishes. 



