720 DR. A. GtJNTHER ON FISHES [Juue 6, 



may be present or absent, and tbeir development is not dependent 

 on the size of the fish. Thus, in a specimen of 155 millim.^ 

 the teeth are limited to the vomer, forming two nari-ow, tapering, 

 oblique patches, without a trace of palatine teeth. In three others 

 (of 162, 190, and 210 millim., Eiipp.) the patches on the vomer are 

 much the same shape, or more band-like, but on the right palatine 

 rudimentary teeth may be seen. In the specimen of 210 millim. the 

 vomerine bands are longer, and behind the end of the band on the 

 left side there is a very small separate patch of palatine teeth. In 

 one specimen of 185 millim. there are distinct palatine teeth, 

 continuous with the vomerine band. Finally in the last (185 

 millim. skel.) the palatine teeth are likewise present, though 

 not symmetrically de\eloped. 



Chrysichthts walkeei, sp. n. 



The height of the body is contained four times in the total length 

 (without caudal), the length of the head 3-| times ; caudal peduncle 

 rather longer than deep. Head broader than high, its greatest 

 depth being contained 1| times in its length. The greater portion 

 of its upper surface (with the exception of the snout) is finely 

 granulated, or covered with only a thin film of skin ; occipital 

 process longer than the basal bone of the dorsal spine, both meeting 

 a little behind the middle of the nape. Snout short, one third of 

 the length of the head, rather broad, depressed, with the upper 

 profile descending in a gentle curve. Mouth wide, much wider 

 than the distance between the eyes. IVasal barbels thin, as long 

 as or longer than the eye ; maxillary and outer mandibulary 

 barbels reaching beyond the gill-opening, if stretched backward. 

 Inner mandibulary barbels slightly anterior to the outer, and 

 half a diameter of the eye distant from each other. The teeth on 

 the palate are confined to the vomer, and form a narrow crescentic 

 band, shghtly interrupted in the middle in front. The band of 



ChrysicMhys walJceri. 



intermaxillary teeth is somewhat narrowed on the sides, each half 

 being twice as broad as long. The width of the bony interorbital 

 space is | of the diameter of the eye, which is contained 1^ times 

 in the length of the snout and 3| times in thab of the head. 

 Dorsal fin not elevated ; the length of its base is two thirds of its 

 distance from the adipose fin, the base of which equals, or is but 

 little shorter than, that of the dorsal. Dorsal spine as long as the 



1 Kot including the caudal filament in these measurements. 



