350 



KErUKT UN FISHES. PART II: SISUKIUAE AiNlJ C\rRIMDAE 



McClellatKl, O. iiuuiilaltis McClelland from the Kalml river'" (nrc Simla), as indicatt-d by 

 Hora (op.cit.), is a young form of the var. griffitlii. 



? Schizothorax labiatus >- Orriniis siiiiiatus 



Tlybridisation among fishes in nature is not a rare occnrrenee and usually takes place 

 between closely related genera of the same ancestral stock or l)et\vccn two congeners that 

 co-occur in specialized and restricted areas, such as the high altitudes of Central Asia, etc.. 

 and live under more or less similar cniiiliiiniis of life. Intermediate forms between Schico- 

 tliora.v and Orciiiiis ha\c often been observed by various authors and recently flora''' has 

 recorded a very interesting series from the Chitral valley which he has designated as ScJii::(>- 

 tliom.v labiatus x Orcinus sitiuatus var. griffitlii. Among the fishes l)rought by the Yale 



Figure 16, A scries (a-e) of vt-iitral biirfaco of head uf five specimens, intermediate lictwicn Schicnlhorax 

 and Orcinus, riniglily showing progressive modifications from Schizoihorax lalnalns towards Orcinus si)ni(ilus 

 type of month parts. (Figures variously magnified.) 



North India i'.xpeditiou there is a series of specimens detailed below which undoubfedly re])- 

 resent intermediate forms l)etween Schicotliorax and Orcinus and as far as can be judged 

 friiui the nature <if the bead, the jaws and the lips, they seem to be hybrids U'tween .S". hibi- 

 (ilits and (). siiiualus: they agree fairlv well with the series describee! li\- Ibira. 



Srinagar (Sta. K 14) ; ca. 5,200 ft 1 (1X0 mm.) 



Rivers and Canals, Srinagar 3 (223, lOO, 150 mm.) 



Lake near Chushol (Sta. L 73) ; 14,735 ft 1 (215 mm.) 



•= McClelland, J.: Calculla Jouni. Xat. Ilisl., II, p. 580 (184.'). 

 "Ilora, S. L.: Kcc. Ind. Mus., XXXVI, pp. 3U7-J10, figs, / and 8 (1934). 



