1920.] N. ANNANDALE & S. I. Hora: The Fish of Seistan. 161 
5. Width of head ss es te r4°7° mim 
6. Length of snout a bf oer 8:0 s 
7- Diameter of eye 45 e 
8. Interorbital width 8°2 i 
g. Longest ray of dorsal 16°7 5p 
10. a5 eal : 179 5: 
11. Length of pectoral =. 17°4 of 
12. No. of branched rays in dorsal 10 
13. " " of eeeanal 6 
14. No. of scales in L.L. 3 er 38 
iS 4 ie 37 In. Series above L.L: 7+ 
10. ay i », below L.L. sie T2t 
ie BA a between L.L. and Ventral 4i 
18. 4 55 516 
LON ape 7s 451 
20. F 5H 5°38 
21 va ” =, 
-Caudal sa 
22 oo ra 4°16 
1-Caudal 
23 eae 3°63 
1-Caudal 
24 =e 433 
Discognathus, Heckel. 
1843. Discognathus, Heckel in Russeger, Reisen, I, 2, p. 1027. 
1863. Discognathus (s.s.), Bleeker, Atl. Zchth., III, p. 24. 
1919. Discognathus, group of D. variabilis, Annandale, Rec. Ind. Mus., 
XVIII, p. 67. 
The genus as restricted may be defined as follows :— 
Cyprininae with a ventral mouth situated only a short dis- 
tance behind the tip of the snout, with exposed cartilaginous jaws 
without horny covering, a fringed membranous, tuberculate upper 
lip, a vestigial lower lip ; situated behind the mouth a more or less 
well-defined adhesive disk less than half as wide as the head and 
consisting of a semi-cartilaginous pad with or without an anterior 
but always without a posterior specialized border, at least partially 
free round the margin but often adherent at the sides or pos- 
teriorly. ‘The snout not modified in either sex. Seven or 8 branched 
rays in the dorsal fin and 5 in the anal. Form compressed, but 
ventral surface slightly flattened. Branchial opening moderate; 
opercular and praeopercular_ borders meeting those of the opposite 
side at an acute angle on the ventral surface some distance behind 
the adhesive disk; branchial isthmus narrow. Scales at least 
nearly as broad as long, somewhat deciduous in the species 
examined, with well-defined radii at any rate on the distal part 
and concentric transverse striae at the base. Pharyngeal bones 
delicate, bearing 11 elongate fixed teeth and at least one free, 
minute tooth; dental formula (omitting free teeth) 5°3°3 3°3°5 or 
5°4'2 2°4°5: teeth closely crowded together. 
Type-spectes: D. variabilis, Heckel (selected by Bleeker). 
This genus is distinguished from Garra (s.s.) by the more 
anterior position of the mouth, the less complex structure of the 
adhesive disk, less flattened ventral surface, and narrow branchial 
