cclx 



Genus — SriVAPTUIiA, Cantor. 



Achiroiiles, Blocker: Msopia, Euryglossa, and Eurypleura, Kanp. 



Brancliioslegals six. Eyes on the right * side, the vpper in advance 

 of the lower. Clejt of month narroiv, twisted round to the left side. Min uto 

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

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

 pectorals may be present, 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 rudimentarjj (jEsopia). Eourthly, both pectorals 

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

 and ctenoid. Lateral line straight. 



50. Synaptura pan, Ham. Buch. Nga-la-chan, Biu'm. D. 59, A. 

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

 rivers high above tidal inlluence. 



Order— PJIYSOSTOMI, Miiller. 



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. 



Family — SiLURiDiB. 



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

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

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

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

 (SiliirincB) or moi-o or less enclosed in bone (Amhtj;cepbne) ; it communicates with 

 the organs of bearin;; by means of the auditory bones. 



Sub-Family — Siluuin^. 

 Air-vessel not enclosed in bone. 



Genus — Aetsis, Bleeker. 



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

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

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

 sometvhat remote from one another. Oill-openings wide. Barbels eight, 

 their bases slightly dilated. ■ Filli/orm teeth in the jaws: none on the 

 palate. First dorsal Jin having a spine enveloped in skin, and Jive or si.i 

 rays : adipose dorsal lotv : pectoral horizontal, with a spine enclosed in 

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

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

 smooth or tubercular. 



51. Akysis Kurzii, Day. D. ^/O, A. 11. Brown. Pegu hills, only 

 attaining u small size. 



• Note.— 'I'ho turma riylit or dextral, ornl left or siui.itval, firo Hiiis oniiiloycd in tlicso ll.it H.shits 

 The Bpeciiijcu is |)Iiicod with ita tail towiirda tlio obsurvcr, tlio Uorsul till Uiiwaids, thy luml duwuwiiril.-- 

 and the coluurcd bide is tho onu referred to. 



