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Show 720 DR. A. G U K T H E R O N FISHES [June 6, may be present or absent, and their development is not dependent on the size of the fish. Thus, in a specimen of 155 millim.1 the teeth are limited to the vomer, forming two narrow, tapering, oblique patches, without a trace of palatine teeth. In three others (of 162,190, and 210 millim., Riipp.) 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 tbe last (185 millim. skel.) the palatine teeth are likewise present, though uot symmetrically developed. CHRYSICHTHYS WALKEKI, sp. n. The height of the body is contained four times in the total length (without caudal), the length of the head 31 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 skiu ; 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. Nasal barbels thin, as long as or longer than the eye; maxillary and outer mandibular}* barbels reaching beyond the gill-opening, if stretched backward. Inner mandibular}* 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, slightly interrupted in the middle in front. The band of \ Chrysichthys walkcri. intermaxillary teetb 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 li times in the length of tbe snout and 3| times in that 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 Kot including the caudal filament in these measurements. |
