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Show 1884.] GENERA SICYDIUM AND LENTIPES. 171 spines ; caudal quite free, ventrals united into a short disk, adherent to the belly. Gill-openings of moderate width ; four branchiostegals. Hab. Rivers of the Sandwich Islands. Synopsis of Species. I. Body naked, ca. 10 tricuspid teeth on each side of the maxillary suture 1. L. concolor. II. Tail covered with small cycloid scales ; ca. 16 tricuspid teeth on each side of the maxillary suture 2. L. seminudus. 1. LENTIPES CONCOLOR, Gill. (Plate XII. fig. 9.) Sicyogaster concolor, Gill, P. Ac. Nat. Sc. Philad. 1860, p. 102. Lentipes concolor, Giinth. Cat. Fish. iii. p. 96; et Fisch. der Siidsee, p. 184, et Challenger Shore Fish. p. 61. D. 6J3. A. g. The upper jaw has ten or eleven tricuspid, and about three conical teeth on each side of the maxillary suture. Upper lip with a median notch. The total length of the body (without the caudal) is rather more than four times the length of the head ; the height of the head is two thirds of the width, and the width the same proportion of the length. The height of the body is contained about seven and three quarter times in the length. Scales none. The diameter of the eye is one sixth of the length of the head, and one half the interorbital space. The length of the pectoral is less than, and the length of the caudal equal to, the length of the head. The caudal is contained rather more than five times in the total length. The fifth dorsal spine is slightly produced. Both first and second dorsal fins are rather higher than the body ; the latter has its origin considerably in front of the anal. Colour uniform purplish, becoming almost yellowish on the tail. Anal fin with a darker marginal band. Total length 3f inches. Hab. Streams of Hawaii. One adult specimen. 2. LENTIPES SEMINUDUS, Giinth. (Plate XII. fig. 10.) Lentipes seminudus, Giinth. Challenger Shore Fish. p. 61. D.6i. A.i. The upper jaw has 15-16 tricuspid, and about two conical teeth on each side of the maxillary suture ; upper lip with a slight median notch. The total length of the body (without the caudal) is four and a half times the length of the head; the width of the head is considerably greater than the height, and is two thirds of the length. The height of the body is less than one sixth of the length. The tail is covered with small cycloid scales. The diameter of the eye is one fifth of the length of the head, and more than one half the 12* |