ccc 



Jorming two angles, one pointing fonoanh, the other backwards, the fourth 

 branchial arch having an accessory respiratory organ. Teeth absent. A 

 single-rai/ed dorsal Jin, having the jjostcriur ray p)rolonged in, some species: 

 ventrals in front of or below dorsal fin : analposterior to the dorsal, elongated : 

 caudal forlcd. 



379. Chatoiissus modcstiis, Dny. D. 16, A. 28, L. 1. 47, L. tr. 17. 

 Last (lorsul r;iy not pioloiigod. Uiiirorm colour. Scales regulai-ly ar- 

 ranged. Irrawaddi and its branches, to 5;} inches in length. 



380. Chaloi'ssns manmina, Ilain. Bach. Macknndi, Ooriah. D. 14, 

 A. 21-24, L. 1. 58-00, L. tr. 22. Large rivers and tanks of Assam, 

 Orissa and Gangetic Provinces, attaining 8 inches in length. 



B. Abdomen without a serrated edge. 



Genus — Mbqalops, (Commers), Lacep. 



Branchiostegals mimerous : psendobranehia absent. Body oblong, 

 compressed. Abdomen rounded. Snout obtusely conical. Mouth anterior, 

 lower jaw prominent. A narrow osseous lamella adherent to the symphysis 

 of the mandibles, covering the intermediate part, between the two bones. 

 Gill-membranes separated. Villiform teeth on the jaws, vomer, palatine and 

 pterygoid bones, likewise on the tongue and on the base of the skull. A 

 single dorsal opposite the ventrals. 



381. Alegalops cyprinoides, Brouss. Cunnay, Mai, : Punnikoum and 

 Naharm, Ooriah : Nga-lan-youet, Bium. D. 18-20, A. 21-27, L. 1. 37-42, 

 L. tr C/6. Throughout tanks along the coasts of India and Burma. 



'Family — NoTOPTEiiiDiB. 



Pseudobvancliia! absent. Body compressed. Tail prolonged, tapering. Margin of the 

 upper jaw I'ormed by tlie iiiter-maxillaries mesial!}', and tbe ma.xillaries laterally. 

 Barbels absent. Opercular apparatus incomplete. A parieto-mastoid cavity on 

 cilber side, leading into tlie interior of tbe skull. A single-rayed dorsal fin, 

 bebmging to tbe caudal portion of tbe vertebral column : anal very long. Head 

 and body sealed. Stomaeli witboat blind sac : two pyloric appendages. Air- 

 vessel present, and divided in its interior. Tbo ova fall into the cavity of tbe 

 abdomeu before exclusion. 



Genus — NoTOPTBUUs, (Lacep.J, Cuv. ^- Val. 



Ilystus, sp. Ham. Buuh. 



Branchiostegals from three to nine. Gill-membranes partly united. 

 Snout obtuse, convex. MuciJ'erous channels on head ivell developed. Cleft 

 of mouth lateral, not deep. Ma.villa formed of a single bone, and articulated 

 to the inter-maxillary. Loiver margin of pre-opercle serrated, likewise some of 

 the other bones of the head. Sub-opercle absent. Teeth in both jaws of 

 irregular sizes, also on vomer, palatines, pterygoid, and sphenoid bones, and 

 in two rows on the tongue. A dorsal Hn present (Notopterus) , or absent 

 (Xenomystu.s) : anal Jin long, united to the caudal. Ventrals, when jiresent, 

 rudimentary and united together. Scales small. Abdomen serrated along 

 its margin. Lateral line distinct. Mucferous channels on head well 

 developed. Air-vessel sub-divided internally, and ending in front in two 

 horns, the anterior of which is in immediate connection with the auditory 

 organs : posteriorly it ends in two branches divided from one another by the 

 hoimal spines. Intestines short. Ccccal pylori long. 



