On a neio Ci/prinoil Fish. 159 



dentnla is simj)ly Thomsoni with the callus-folds 8ituatc<l at 

 the anterior aica of the back of the shell more strongly 

 developed. 



In a serio:^ of co-typos from the collection of the late 

 Mr. (J. E. lieddome there are some specimens entirehj without 

 these foh/sj and a selected series seems to demonstrate tiiat 

 these folds are only fully developed in the last stage of 

 growth. 



It is sifTuifitant that in the description of P. hidentata there 

 was no comparison made with the obviously closely allied 

 P. Thomsoni. 



XVIIT. — Description cf a new Cyprinoid Finh, Acheilo- 

 giiatlius sigiiifer, /y-fw Kurea, with a 'Synopsis of all the 

 knoion Khodeinas. By L. S. Uekg (St, Petersburg). 



Acheilognathus siynifer. 



Closely allied to A. cyanostignia, Jordan & Fowler, 1003, 

 fnmi Japan (Lake Biwa), differing chiedy in coloration and 

 longer barbels. 



No dark shoulder-spot above gill-opening, no longitudinal 

 band on body, neither on tail. Dorsal deep brown, with a 

 broad nhirginal ichitish band. Anal with several darker 

 longitudinal cross-bars. Ventral blackish. 



D. 118. A. 118. L. 1. 3G'. 



Teeth 5 — 5, not serrated. No spines in dorsal and anal. 

 Barbels present, ratlier long, somewhat more than half the 

 length of the eye, reaching to the vertical from tlie anterior third 

 of eye. Mouth small, subinferior. Maxillary reaching to the 

 nostrils. Depth of body 2^ in its length (without caudal), 

 length of head 4; diameter of eye ^ length of head, slightly 

 less than interorbital spiace, equal to snout, 11 in postorbital 

 space. Caudal peduncle 3|A in body, twice as long as deep, 

 its depth 2^ in that of body. (Origin of dorsal somewhat 

 behind the root of ventrals, midway between end of snout and 

 root of caudal ; its end opposite to the third branched ray of 

 anal. Base of dorsal 5^ in body, height 6. Upper margin 

 of dorsal straight. Origin of anal below the posterior 

 dorsal rays; its base 6, ^,) in body, its height Q>\. Pectonils 

 not reaching ventrals, 5^ in body ; ventrals G, reaching origin 

 of anal. Lateral line slightly decurved ; G scales between 



