1920.]| N. ANNANDALE & S. L. Hora: The Fish of Seistan. 189 
The posterior diverticulum of the air-bladder is longer than 
the diameter of the transverse tube from which it originates and 
its vesicle is longer than the stalk. 
Type-specomen No. F 1222/1 (Z.S.1.). 
The type-specimen was obtained by the Seistan Arbitration 
Comunission in the delta of the Helmand. Young and half-grown 
fish were found in great abundance in small pools in the bed 
of the Randa stream near the ruined city of Jellalabad some 
12 miles north of Nasratabad, at the end of November. They 
were huried at a depth of some inches in the mud at the bottom 
of the pools and seemed to be in a healthy and active condition, 
although the water was extremely foul and most of the Cyprinidae 
in the pools were dead or dying. The species is evidently 
predaceous, for remains of other fish were found in the stomach, 
and also those of a may-fly larva (Palingenza') that occurred in 
large numbers with it. Other members of the same association 
were the crab Potamon (Potamon) potamios gedrostanum and the 
molluses Corbicula filuminalis and Lamellidens marginalis rhadt- 
naeus. 
Adiposia rhadinaea (Regan). 
1906. Nemachilus rhadinaeus, Regan, Fourn. As. Soc. Bengal, iI, p. 8. 
We again quote Mr. Regan’s description of the species to 
facilitate reference. 
“Depth of body 7 to ro in the length, length of head 5 
to 51. Depth of head s to+ its breadth, which is 13 
to 12 in its length. Diameter of eye 71-8: in the length 
of the head and 1: to 2 in the interorbital width. 
Snout longer than postorbital part of head. Cleft 
of mouth extending to below the nostrils ; lips moder- 
ately thick, smooth, the lower interrupted medianly ; 
six batbels; outer rostral barbel as long as the 
maxillary barbel, extending to or beyond the nostrils. 
Scales entirely wanting. Dorsal III 7, its origin nearer 
to tip of snout than to base of caudal; free edge 
of the fin convex. Anal II-III 5. Pectoral extend- 
ing about 1 of the distance from its base to the base 
of the ventral. Ventrals 8-rayed, originating below 
the anterior branched rays of the dorsal, extending 
1—s of the distance from their base to the origin of 
anal. Caudal slightly emarginate. Caudal peduncle 
2 to 23 as long as deep, its length 5 to 51 in the length 
of the fish. Large, oblong or rounded dark spots on 
the back and sides; dorsal and caudal with some 
small dark spots, lower fin pale, immaculate.” 
“Three specimens 165-260 mm. in total length.”’ 
1 See Gravely, Rec. Ind. Mus. XVIII, p. 137 (1920). 
