16 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
East Indies; widely distributed, north to Riu Kiu Islands. This 
description is from a specimen 115 niillin.eters lonj^-, from Ishioaki, 
Yaeyama Island, Riukiu. We identity this specimen with //. kuda 
with some doubt, and Ave are not sure of the synonymy of the species, 
even if the identification be accepted. According to Dr. Da}^ the 
number of ring's in IL l-mfa {(/uUi//afi/s) is 11 + 33. The relations of 
this species to the other large-sized and long-nosed sea horses are still 
obscure. 
{Kiida^ a tube, in Japanese.) 
15. HIPPOCAMPUS HISTRIX Kaup. 
Hip})()cainpus Idstrix Kaup, Lopho))r., 1856, p. 17., pi. 11, fig. 5, Japan. 
Hippocampus hystrix Gunthek, Cat. Fish., VIII, 1870, p. 206, Zanzibar. — 
DuMERiL, Hist. Nat. Puiss., II, 1870, p. 514, Nagasaki, He of Reunion. 
Dorsal rays 17 or 18. Snout thin, elongate, longer than rest of 
head, as long as distance from front of orbit to first nuchal spine; all 
the tubercles of body developed into long, slender, acute spines, those 
on certain rings longer than the others. Color pale, with numerous 
white dots; snout with broad dark rings; each spine black at tip. 
Length, 2i inches. (Giinther, Zanzibar specimens.) Kaup does not 
count the fin rays, and says that his specimen is uniformly colored. 
In his figure the spines along the back are higher than the coronet, 
and 2i to 3^ in length of snout; the coronet is very low, bifurcate at 
tip; spines on back of tail especially prominent; body slender. 
East Indies: a few specimens known, recorded from Japan, Zanzibar 
and the Isle of Reunion, not seen by us. 
{IJf/st/'ix, porcupine.) 
16. HIPPOCAMPUS JAPONICUS Kaup. 
KITA-NO UMI-UMA (NORTHERN SEA HORSE). 
(Plate X. ) 
IlipjKjcaiiipasjaponims Kaup, Lophol^r., 1856, p. 7, Nagasaki, Ley<len Museum. — 
DuMERiL, Hist. Poiss., II, 1870, p. 505, same type. 
Head If (li to If) in trunk; trunk 2 to 2i in tail; D. 16 or 17; 
P. 11 or 12. Rings 11 + 39. Snout 2f to 3 in head. Eye 1^ to 2 in 
snout. Snout 2 to 2i in depth of body. Coronet from gill-opening, 
li to H in snout. Dorsal covering 2 + li rings. Prominent rings 
1, 4, 7, 11 on the body; 5, 10, 15 on tail, these subject to considerable 
variation. 
The body moderately deep, the tail very slim, the snout very short. 
Spines on ])ody blunt and short. Coronet low, compressed, keel-like; 
supraocular spine low; no spine before eye. Spines at base of dorsal 
little enlarged. Length 2i inches. 
Color various. A specimen from Tokyo is light brown, with two 
black cross bands on bodv and four of difi'erent widths on tail; head 
