723 
108(a). AGONIDiE. 
head externally entirely bony, the plates often spinous ; eyes large, placed 
high; suborbital stay cuirassiug the cheek; mouth teriniual or inferior; 
barbels often present; teeth small, in villiform bands, on the jaws, and 
often on the vomer and palatines also; gills 3^^, no slit behind the last; 
pseudobranchim very large, usually extending down the inner side of 
the opercle; gill-rakers small; gill-membranes united, free or joined to 
eye; 2 small spines above snout; dorsals well separated. Head 3|; depth 3. D. 
IX-ti; A. 10; Lat. 1. 33. Kamtschatka. (Gunther.) 
(Aspidophorus quadricornis Cuv. &, Val. iv, 221, 1829: Agonus quadricornis Gunther, 
ii, 215.) 
HIPPOCEPHALUS Swainson. 
(Swainson, Class. Fish. »fcc., 1839, 272: type Aspidophorus superciliosus Cuv. & Val.) 
Body moderately elongate, compressed, the head depressed at the nape; dorsal 
spines strong, the first inserted close behind the nape; dorsals well separated; jaws 
equal, or the lower slightly the longer; breast granulated; gill-membranes not de- 
scribed, probably free. (iitTCoi, horse; necpaXr], head.) 
H. japonicus (Pallas) Gill. 
Yellowish brown, the body banded and the fins with dark lines. Top of head not 
very rough; a flat triangular prominence, directed upward and outward above each 
eye, concealing the eye when viewed from above; 2 spines above the snout; subor- 
bital with 2 or 3 spines, one of them with a barbel; suborbital stay broad, gibbons; 
barbels small; bony plates rough-striate, pyramidal, the center raised; ventrals half 
as long as pectorals; dorsals separated by a space greater than length of either; fins 
all very rough. Depth 5. D. VI-17; A. 8; Lat. 1. 45. L. 12 inches. Kurile Islands. 
(Cuv. Val.) 
(Cottus japonicus Pallas, Spicilegia fasc. vii, 31, 1772: Agonus curilicus and Agonus 
stegophthalmiis Tilesius, M(Sm. Ac. Petersb. iv, 416, 427 : Aspidophorus superciliosus Cuv. 
& Val. iv, 215: Agonus stegophthalnms, Gunther, ii, 214.) 
Brachyopsis dodecaedrus (Tiles.) Bean. 
Brownish, body and fins banded. Body elongate ; snout obtuse, depressed, without 
spines; mouth nearly vertical, the lower jaw considerably produced; interorbital 
space as wide as eye ; suborbital with spines ; breast with many small convex polyg- 
onal plates; keels of the scales ending in a small point. Head 5; depth 8. D. XI-7 ; 
A. 15; P. 15; V. I, 2; Lat. 1. 40. Kamtschatka; common. (Cuv. Val.) 
(Agonus dodekaedrus Tiles. M6m. Ac. Petersb. iv, pi. 13, 1811: Phalangistes loricatus 
Pallas, Zoogr. Ross.-Asiat. iii, 114: Aspidodophorus dodecaedrus Cuv. Val. iv, 209: 
Agonus dodecaedrus Gthr. ii, 214.) 
Siphagonus segaliensis (Tiles. ) Steind. 
Yellowish brown; fins with black bands. Form resembling Brachyopsis rosfratus, 
but the tail shorter; body depressed ; eye behind middle of head; two spines on the 
suborbital, and some others about eyes; dorsals contiguous; anal longer than second 
dorsal ; no barbels under the throat ; gill-membranes and barbels at chin undescribed. 
D. VII-8; A. 12; C. 10; P. 14; V. I, 2. L. 7 inches. Island of Saghalien. (Cuv. f 
Val.) 
(Syngnathus segaliensis Tiles. M4m. Soc. Imp. Nat. Moscou, ii, 216: Agonus Icevigatus 
Tilesius, M6m. Acad. Petersb. iv, 436: “Aspidophore lisse” Cuv. & Val. iv, 214.) 
