6 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 82 



Descyi'iption, based on the holotype and all paratypes (counts and 

 measurements of paratypes given in parentheses). — The body is 

 rather deep; depth, not including dorsal sheath, 1.8 (1.8 to 2.1). It 

 is moderately compressed ; width, 8.4 to 3.7 in depth. The least depth 

 of the high and thin caudal peduncle is contained 1.7 to 2.2 times in 

 the head. The caudal peduncle is almost twice as deep as its length 

 measured on midline behind vertical from end of anal base. The 

 dorsal contour is decidedly more sharply curved than the ventral; 

 as a whole, it is a high, even arch, but is gently concave in the nuchal 

 region. 



The head is a thick, blunt, almost symmetrical cone as seen from 

 the side. The mouth, moderately oblique, rises to opposite lower 

 part of eye. The eye is of moderate size, and the interorbital mod- 

 erately convex. Length of head, including opercular membrane, 

 3.4 (3.2 to 3.5) in standard length. Least fleshy interorbital width, 

 3.6 (3.2 to 4.3) in head; least suborbital width, 2.4 (2.1 to 3) in orbit; 

 greatest diameter of orbit between rims, 3.7 (3.5 to 4.1) in head; 

 length of upper jaw, 2.7 (2.65 to 2.9). 



The teeth are in two rows in the upper jaw (sometimes so irregular 

 backward as to appear to form three rows ; sometimes uniserial at ex- 

 treme end of band). In the lower jaw, the teeth are biserial in front, 

 but become irregularly uniserial on the sides. The teeth in the outer 

 row in each jaw are considerably enlarged, somewhat curved, scarcely 

 incisorlike. 



The gill rakers are of moderate length and number. The longest 

 is contained 1.7 (1.6 to 2.2) times in the orbit. The number on the 

 first arch is 9 (6 to 8) + 16 (14 to 17) = 25 (21 to 23). 



Scales, 66 (61 to 68) in lateral line to end of hypural; 61/2 (71/2 

 in one) rows between middle of sheath along first dorsal and lateral 

 line; 22 (20 to 24) in a series from origin of anal to lateral line. 



Dorsal rays XI (X or XI, usually X), 26 (24 to 28) ; anal rays 

 III, 29 (25 to 31) ; principal caudal rays 14 (outer pair unbranched; 

 13 in one) ; pectoral rays, 26 (25 to 29). 



The spinous dorsal is relatively low and rounded. The first four 

 spines are short, and graduate rather slowly and evenly; the fifth 

 to seventh are subequal (the sixth rarely considerably the longest) ; 

 the following spines are progressively shortened. The heteracan- 

 thous dorsal spines are very strong, and as a consequence the sup- 

 porting interneurals are also much strengthened, and produced out- 

 Avard as sharply expanded keels. The soft dorsal is almost straight- 

 edged (slightly convex to slightly concave). The first soft ray is 

 about one-third higher (rarely scarcely higher) than the highest 

 spine, which, measured from the top of the scaly sheath, enters the 

 head 2 (1.8 to 2.9) times. 



