NO. 1241. OOBIOID FISHES OF JAPAN— JORDAN AND SNYDER. 
115 
Measurements of Tridentiger obscurus. 
Length in millimeters 
Depth expressed in hundredths of length. . 
Depth of caudal peduncle 
Length of head 
Length of snout 
Width of interorbital space 
Diameter of orbit 
Distance from snout to spinous dorsal 
Distance from snout to soft ilorsal 
Heightof longest dorsal spines 
Height of longest dorsal rays 
Distance from snout to anal fin 
Height of longest anal rays 
Length of caudal peduncle 
Length of caudal fin 
Length of pectoral fin 
Length of ventral fin 
Number of dorsal spines 
Number of dorsal rays 
Number of anal rays 
Number of pectoral rays 
Number of scales in lateral series 
Number of scales in transverse series 
Naga- 
Ishika- 
saki, 
walien. 
Hi- 
zen. 
80 
66 
55 
26 
21 
24 
13 
13 
12i 
30 
30 
31 
10 
9 
U 
4^ 
4^ 
4i 
4 
H 
5 
41 
42 
40 
61 
60 
60 
23 
m 
28 
16i 
14 
16 
65 
66 
65 
15 
14 
14 
22 
24 
22 
2H 
22 
22 
23i 
25 
24 
16 
16 
18 
8 
6 
6 
11 
12 
12 
11 
11 
11 
20 
21 
20 
34 
37 
33 
15 
16 
17 
49. TRIDENTIGER BUCCO Jordan and Snyder, new species. 
Head 3^ in length; depth 5^; depth of caudal peduncle 7; eye T in 
head; snout -li; maxillary 2i; D. Vl-13; A. 11; P. 20; scales in lateral 
series 48. in transverse series 15. 
Body rathei- robust, not tapering much toward the tail; caudal pedun- 
cle almost as deep as body, compressed. Head broad and depressed; 
its depth contained If times in its width; cheek muscles enormously 
developed, puffed out on either side beyond contour of body; top of 
head flat; interorbital space broad, the distance between eyes 2^ times 
their diameter. Snout rounded. Eyes very small, directed laterally; 
anterior in position. Mouth oblique; jaws equal; maxillary reaching 
a vertical, passing a little beyond eye; entirely concealed by the lip 
and suborbital. Tongue broad, round anteriorl3^ Teeth in 2 series 
on the anterior part of jaws; the outer ones in a single row, trilobed, 
except 2 or 3 posterior ones, which are simple; the middle lobe high 
and rounded, the lateral lobes short and sharp; inner series of lower 
jaw in 3 rows; simple, slender, sharp, and curved backward; inner 
series of upper jaw in a single row, similar to those in the corre- 
sponding position below; no canines. Gill opening extending a little 
below base of pectoral; width of isthmus equal to space between eyes. 
Shoulder girdle with a narrow ridge on inner edge; no papillae. Gill- 
rakers on first arch 3 + 8 ; short and pointed. 
Head naked; no barbels or conspicuous rows of mucous pores. 
Anterior nostril with a thin-walled tube. Bod}^ covered with large, 
weakly ctenoid scales, except a small naked sjmce beneath ventrals. 
Dorsals separate, the membrane of the spinous dorsal attached to 
the base of the first ray; spines slender and flexible; the third longest; 
