164 



C. ISniKAWA. 



As will be seen from the descriptions and the figures, this latter 

 species differs in a marked way from the former in its much slender 

 form, its longer head and in its longer and deeper emerginated caudal fin. 

 It is also less darker in colour, its peritoneal pigments brown and it has 

 an additional number of pharyngeal teeth. 



The genus Leucogobio is first given by Dr. A. Günther to two species 

 of Chinese fishes collected by Russian naturalists during the years 1892- 

 94, the one from the head waters of Yangtsckiang and the other from 

 Hui-hsien, and are named as L. taeniatus and L. herzensteini. The 

 fishes now described from our lake, form, as far as I know, the two addi- 

 tional species to this interesting genus. It will be allowed, however, to 

 make a slight alteration in the generic diagnosis given by Günther) in as 

 much as the formula of the pharyngeal teeth of L. jordani is 5 or 

 fi/3-3/6 or 5, and not 5/3 or 2 or 1-1 or 2 or 3/5 as he states. Anyhow, it 

 is of some interest to find that the fresh water forms of the central portion 

 of Honshyu are related to those of China, and that these are not as yet 

 known from Hokkaido. The occurrence of the giant salamander, 

 Megalobatrachus sieboldii, in China and in mountanous portions of 

 Southern Honshyu will also come to the same category. 



College of Agriculture, May 1900. 



EXPLANATION OF PL. III. 

 Fig. 1. Leucogobio güiitheri, Natural Size. 



Fig. la. ,, „ Dorsal view of the head. 



Fig. lb. ,, „ Ventral view of the head. 



Fig. lc. ,, ,, Tail of a small specimen showing the triangular spot at its base. 



Fig. Id. „ ,, Pharyngeal teeth, |- X Zeiss. 



Fig. le. „ ,, Anterior part of two individuals, showing the holes made by an 



ectoparasitic Crustacean just behind the pectoral fin. 



Fig. 2. Leucogobio jordani, Natural size. 



Fig. 2a. ,, ,, Dorsal view of the head. 



Fig. 2b. ,, „ Ventral view of the head. 



Fig. 2c. ,, ,, Pharyngeal teeth, -| X Zeiss. 



Fig. 2d. „ ,, Pharyngeal teeth of another specimen. 



