18S4.] 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 Bpecies. 



I. Body naked, ca. 10 tricuspid teeth on eacli side of tlie 



maxillary suture j _ x. concolor. 



II. Tail covered with small cycloid scales ; ea. 16 tricuspid 



teeth on each side of the maxillary suture 2. L. setnifiudus. 



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 

 Sudsee, p. 184, et Challenger Shore Fish. p. 61. 



D.6i. A.i. 



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 almo&'t 

 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.^. 



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 con- 

 siderably greater than the height, and is two tbirds of the length. 

 Ihe 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* 



