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Show 1892.J ON ANTELOPES OF THE GENUS CEPHALOLOPHUS. 413 Lucioperca marina thus agrees in its scale- and fin-formula with L. canadensis, whilst in its compressed back and almost naked head it agrees with L. 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 f length of snout and } 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 fourth of eye, the width of its distal extremity rather more than \ diameter of eye; head naked, except a few scales on the operculum ; opercular spine feeble. Dorsal XIII, I 17; originating above axilla, the two portions 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 \ length of head. Ventrals separated by an interspace equal to § the width of their base; spine very feeble and closely attached to the soft rays. Middle caudal rays | length of outer. Scales 115 f0; L. 1. 79. Pyloric appendages 5, the longest as long as the stomach, the shortest only half as long. Brown above (in spirit), whitish beneath; ten dark vertical bars on the sides ; first dorsal blackish, second with a blackish bar along the middle. Total length 280 millim.1 3. O n the Antelopes of the Genus Cephalolophus. By OLDFIELD THOMAS, F.Z.S. [Eeceived April 30, 1892.] The genus Cephalolophus has long stood in need of a general revision, and I 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 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 |