1892.! ON ANTELOPES OF THE GENUS CEPHALOLOPHUS. 413 



Lucioperca marina thus agrees in its scale- and fin-tbrmula with 

 L. canadensis, whilst in its compressed back and almost naked head 

 it agrees with i. vitrea. The following description is taken from 

 the specimen in the St. Petersburg Museum (No. 6205, Alexan- 

 drowsk, Caspian Sea). 



Depth of body 4^ times in total length, length of head 3f times ; 

 diameter of eye about | length of snout and 4- length of head, and 

 nearly equal to interorbital width ; strongly enlarged, canine-like 

 teeth in jaws and palate ; lateral prsemaxillary teeth forming a single 

 series ; maxillary reaching to below posterior fourtli of eye, the 

 width of its distal extremity rather more than g diameter of eye ; 

 head naked, except a few scales on the operculum ; opercular spine 

 feeble. Dorsal XIII, 117; originating above axilla, the two por- 

 tions nearly equally deep, the spinous ^ longer than the soft, from 

 which it is separated by an interspace equal to | the diameter of 

 eye; first spine | length of second, | length of longest. Anal II 

 12 ; a little deeper than dorsals ; spines very feeble and closely 

 attached to the soft rays. Pectorals g length of head, Ventrala 

 separated by an interspace equal to | the width of their base ; spine 

 very feeble and closelj' attached to the soft rays. Middle caudal 

 rays I length of outer. Scales 115 1^^; L. 1. 79. Pyloric appen- 

 dages .5, the longest as long as the stomach, the shortest only half 

 as long. Brown above (in spirit), whitisli beneath ; ten dark 

 vertical bars on the sides ; first dorsal blackish, second with a blackish 

 bar along the middle. 



Total length 280 millim. ' 



3. On the Antelopes of the Genus Cephalolophus. 

 By Oldfield Thomas, F.Z.S. 



[Received April 30, 1892.] 



The genus Cephalolophus has long stood in need of a general 

 revision, and 1 am enabled to undertake such a work owing to 

 the fact that the types of a very large number of the described 

 species, valid and invalid, are in the collection of the British Museum. 

 These types have all been carefully examined and compared, and, 

 whatever its other shortcomings may be, it is hoped that the present 

 paper will at least be of service to zoologists by clearing up some of 

 the many doubtful questions of which the solution depends on these 

 typical specimens. 



It has not been thought necessary to give full synonymies of the 

 species, these being fully given in Gray's numerous papers on the 



1 The total length of a Percoid fish should be given to the extremity of the 

 middle caudal rays. In describing the proportions, it is of course necessary to 

 exclude the caudal fin altogether, as we exclude the vertical fins in measuring the 

 depth of the body. 



Proc. Zool. Soc— 1892, No. XXIX. 29 



