cclx 



Genus SYNAPTURA, Cantor. 



Achiroides, Bleeker: JEsopia, Euryglossa, and Eury pleura, Kaup. 



Branchiostegals six. Eyes on the right * side, the upper in advance 

 of the lower. Cleft of mouth narrow } twisted round to the left side. Minute 

 teeth only on the left side : palate edentulous. One of the nostrils on the blind 

 side dilated in some species, not so in others, whilst amongst the latter both 

 pectorals may Represent, the right being somewhat the longer. Some have the 

 nasal tube small or simple (Synaptura), or bifid (Euryglossa). Secondly, 

 the left pectoral may be longer than the right (Anisochirus) . Thirdly, the 

 left pectoral may be rudimentary (^Esopia). Fourthly, loth pectorals 

 may be absent ( Achiroides) . The vertical fins are confluent. Scales small 

 and ctenoid. Lateral line straight. 



50. Synaptura pan, Ham. Buch. Nga-la-chan, Burm. D. 59, A. 

 45, L. 1. 75. This species of sole is found in the Ganges and Burmese 

 rivers high above tidal influence. 



Order PHYSOSTOMI, Mutter. 



All the fin rays articulated, except the first in the dorsal and pectoral, 

 which are frequently more or less ossified. Ventral fins, when pre- 

 sent, abdominal and spineless. Air-vessel, if existing, having a 

 pneumatic duct. 



Margin of the upper jaw formed by the inter-maxillaries ; the maxilla rudimentary 

 often constituting the base of a barbel : no sub-opercle. The rayed or adipose 

 dorsal fins may be present or absent. Skin scaleless, and either smooth or covered 

 with osseous plates. Air-vessel, when present, either free in the abdominal cavity, 

 (SilurincB) or more or less enclosed in bone (Amblycepince) ; it communicates with 

 the organs of hearing by means of the auditory bones. 



Sub- Family SILUEIN.E. 

 Air-vessel not enclosed in bone. 



Genus AKYSIS, Sleeker. 



Body rather elongated: dorsal profile nearly horizontal: neck not ele- 

 vated. Read depressed, covered superiorly with soft skin. Eyes small, sub- 

 cutaneous, Mouth terminal, transverse: jaws of 'unequal length. Nostrils 

 somewhat remote from one another. Gill-openings wide. Barbels eight, 

 their bases slightly dilated. Villiform teeth in the jaws : none on the 

 palate. First dorsal fin having a spine enveloped in skin, and five or six 

 rays : adipose dorsal low : pectoral horizontal, with a spine enclosed ir 

 skin : ventral with six rays, entirely behind the dorsal: caudal forked : ant 

 of moderate length (9-11 rays). Air-vessel not enclosed in bone. Skin 

 smooth or tubercular. 



51. Akysis Kurzil, Day. D. /0, A. 11. Brown. Pegu hills, onl; 

 attaining a small size. 



* NOTE. The terms right or dextral, and left or sinistral, arc thus employed in these flat fishe 

 The specimen is placed with its tail towards the observer, the dorsal fin upwards, the anal downwards 

 and the coloured side is the one referred to. 



