SCIENTIFIC RESULTS 



OF 



THE SECOND YARKAND MISSION. 



ICHTHYOLOGY. 



BY FEANCIS DAY, F.L.S., F.Z.S. 



THE following descriptions refer to the entire collection of fishes obtained during the 

 expedition (except, so far as I know, two specimens 1 ). With them I have compared 

 some types of Steindachner's excellent paper on Dr. Stoliczka's " Fishes of Tibet " (Verh. z.-b. 

 Ges. Wien, 1866), which specimens were given me by Dr. Stoliczka. 



Mr. Hume, C.B., has since then obtained a few more skins of fishes from those regions 

 through the exertions of Dr. Scully. These have likewise been forwarded to me ; and one 

 appears to be a very aberrant form of Ptychobarbus. 



Order PHYSOSTOMI. 



Family SILURIDJB 

 1. EXOSTOMA STOLICZKJS. Plate I, fig. 1. 



Day, Proc. Zool. Soc. 1876, p. 782. 

 D. 1, P. T V, V. i, A. 6, C. 15. 



Length of head from 4 in the young 2 to 5f , of caudal 8, height of body 7| in the total 

 length. Eyes minute, situated in the middle of the length of the head ; the width of the 

 interorbital space equals half that of the snout, or the distance between the eye and hind 



1 These two specimens are in the British Museum. 



2 The remarkable difference in the comparative length of the head to that of the total length is shown in the following 

 figures : 



3 specimens 4 inches in length. Head 4 to 4| in the total length, 



4 4-2 to 4-5 4 to 5J 



5 6-0 to 57 5 to 5 

 3 6-0 to 6-6 5| to 5f 

 2 , 7 5i to 5 



