348 



REPORT ON FISHES. PART II: SISORIDAE AND CYPRINIDAE 



The speciiufiis under report agree tairly well with the (lescriptimi nf tiie speeies and 

 exhibit weTl marked differences from the variety griffithi McClelland from Afghanistan, 

 whirh has been recently redescrilied by Ilora." O. siitualus is very closely allied to O. pla- 

 giostoiuiis, but differs from it chiefly in the structure of the serrated dorsal spine, which is 

 long and strong with moderate serrations on its posterior border in sinuatiis and consid- 

 erably weak with feeble or obsolete serrations in plagiostoiiius (Text-figure 13, o, b). 



13 



Figure 13. Dorsal spines of nearly equal-sized specimens of (a) Oreimis plagiostcmus (Heckel) and (6) 

 Oreinus sinuatus (Heckel), showing difference in structure of spines and nature of serration on their posterior 

 borders. X ca. 2. 



Figure 14. Ventral views of head of nearly (■(|iial-sized specimens of (<i) Orciiiiis f'liif;i,isli'iiiiis (Heckel) and 

 (b) Oreinus siiiiialus (Heckel), showing difference in gape of mouth and structure of lower lip. X 1>4- 



Further, siuimhis has invariably a deeply concave margin of the lower li]) which is more 

 or less straight or slightly concave in plagiostoiiius (Text -figure 14, a, b). Ihe anal scales 

 in siniMtus are not well developed and are often olxsolete, the largest lx;ing nearly half as 

 broad as the orbit, whereas in plagtostonius they are well defined and almost as broad as the 

 orbit. From the Expedition material as also from the Indian Museum speciriiens from dif- 

 ferent localities T find that in O. siiniafus the dorsal spine is somewhat variable in length. 



" Hora, S. L.: Rcc. Ind. .Uxs., XXX\I. pp. 300-306, figs. 4 and 5 (1934). 



