166 Records of the Indian Museum. (Vor. XVAaE 
dry stream-beds in December. They perish annually in enormous 
numbers at this season as the water grows salt or foul owing to 
evaporation or to the excreta of large flocks of sheep and goats 
belonging to the nomad tribes who camp near the stream-beds. 
The Discognathus is found, alone or with D. phryne, also in 
permanent. irrigation channels and is very abundant in those that 
supply the garden of the British Consulate at Nasratabad or 
Shahr-i-Seistan. A few moribund individuals were caught at the 
same season in the reed-beds of the Hamun-i-Helmand, but the 
reason why they were dying was not apparent, for the water was 
neither salt nor foul. Numerous healthy individuals were captured 
in a reedy canal leading out of the Hamun a few days later. 
Discognathus adiscus, Annandale. 
Measurements (in millimetres). Number of Fin-rays, Scales and 
Proportions. 
| | | a 
1} Total length (including | | 
“| caudal) .. . + | §0°5| 58°9) 41-0) 70°4| 41°5| 56°3) §7°3, 54°38 63°7 600) 52°3| 46°0 
2) Length of caudal 5. | ELERO)! 5CC HO}! “(ORO} 14°6) “8-2| 13-0] 13°1, 11°4 140, 13°0| 11°8, 10°0 
3| Greatest depth of Pe 9'0, 10°7| 8:0) 13°6| 8-1] 11-0] 11-0) OVI git oy 10°2)10°0, 7°O 
4| Length of head : 9°s|11°5| 7°5 12°9| 8-0] 10°6 10°8 103] 11°5| TO 6 10°4 9:0 
5 Width of head .. | 78) 8:2] 5:6, g:o| 61 7:8! 7-8) 7:0| 7-8 8:6] 7-2] 6-2 
6) Length of snout 3°3|!4°6| 370) 50, 3-2/2 3:9) 14255 325) taro! “AO aeslunsca 
7| Diameter of eye 2°5| 2:9).)2:2|| -3°3)'- 2:4! 3:0| 328] 370; 43°3h= 350) anne 
8) Interorbital width 4°3| 5°0| 4°0| 6°8, 4:0] 5.0| 5-0 4:9! 5:0 5°25 -Clesaie 
9 Longest ray of dorsal. g-2'12°5| 972/14°6) 8°3) 11-0 I1°3) 10°6 130] 12°2) 10°8] 9°38 
10, Longest ray of anal ..:| 7:0; 8°4) 5°1;10°3| 6:0! 7°5| 7°7| 69, 9°6| 8:8) 8-2] 6.5 
1 Length of pectoral | 7°4|10:7| 6:9 12°8| 7°1| 9:2) 10:0} 9.3! 11-2| 10:7; 8-6) 8-0 
12| No. of branched rays | | | | 
in dorsal 8 a) Beale re: d Tail “gains | Telstar 
13, No. of branched rays | | | 
in anal .. eae S ab ah sole S oi gSeaia 5 lS elpoe seas 
14| No. of scalesin L-L.;.»| 37 | 36 | 36 | 37 | 37°} 37 | 37 | 37-1 37 | 35 | 35 30 
IS No. of scales in ane: | | | 
verselineaboveL.L. | 5 5 Gop g Gt Bie 5 5 5 5 5 
16 No. of scales in trans- 
verse line below L.L. | 63 | 6} | 6$ | 6} | 63 | 63 | 63 | 62 | 63 | 64 | 6% | Of 
Vy, z- | 4°59| £153| 4°55 482! 5° 06 4°33| 4°37, 48| 4°55) 4O1| 4°43] 4°3 
18 +. | 5°6 | 5S | 5°22 5°17) 5°12 S11) 52 | 5°76) 5°79| 588) 5°23) 0'57 
19| a: 5°31| 5° | 5°49) 5°45| 5°18) 5°31) 5°3 | 5°32| 5°53| 5°00, 5°03) 5-11 
he + + | 3°8 |3°9"| 3°41) 3°9 |3°3 | 3°53! 3°48) 3°43] 3°5 | 3°53) 2°73) 3°40 
ss 1-Caudal | | | } : | semezaliey ell aes ’ 
21 neat : . = | 3°59| 3°53'3°55| 3°62| 400! 3°33] 3°37|3°S | 3°55] 3°O1| 3°43] 3°0 
pi FCaudal | | | | _pelliMe ; : Pere le ; 
a2 fan ; +. |44|43 40 |4°T (4°13 3°93| 40 |4°57| 4°51) 40 | 4°05) 5°4 
3 | | | 
a 1-Caudal | | ‘ 
23 a ee .. |4°3 | 40 | 4°26] 4°32, 4:16 4°08] 4:07, 4°21] 4°32, 4°43) 3.9 | 4:0 
Discognathus phryne, Annandale. 
? 1897. Discognathus variabilis, Nikolsky, Ann. Mus. Zool. Ac. Sci., St. 
Petersburg, II; p. 347. 
1899. Discognathus variabilis, Nikolsky (? in part), 7bid., IV, p. 412. 
1906. Discognathus variabilis, editorial note to Regan, Fourn. As. Soc. 
Bengal, il, p. 8. 
1919. Discognathus phryne, Annandale, Rec. Ind. Mus., XVIII, p. 70, 
pl, mes; appl isi tis 2. 
