18 
NEW OF, LITTLE KNOWN FISHES 
ridges, but especially the median abdominal, armed with well 
developed, subacute tubercles. The three posterior dorsal rings 
elevated above the others. Dorsal ridge of tail not continued on the 
body rings ; ventral ridge continuous with but on a lower plane than 
the lateral body ridge, without cessation of tubercles. Base of 
dorsal fin as long as or somewhat shorter than the snout. Preanal 
length about f of that of the tail. Brown, the sides of the abdomen 
with a golden tinge ; snout and sides of the head dull leaden blue 
in fresh specimens ; tips of the trunk tubercles light-colored, 
forming bands. Dorsal fin with a dark basal band. Irides white. 
[Named for Mr. Christian Dahl, who first sent me a specimen]. 
Length of largest (type) example 105 millimeters. 
Type in the Queensland Museum, Brisbane. 
Coast of southern Queensland. 
Dahl's Sea-Horse is related to the Chinese and "West Malayan 
H. trimaculatus* from which it differs in the greater length of the 
dorsal fin, the increased number of caudal rings, the more slender 
body, the greater number of coronal spines, etc. ; also to the 
H. subelongatusi of West Australia, from which it may be 
distinguished by the increased number of dorsal rays, the shorter 
snout, the lower coronet, etc. 
On recognizing that Mr. Dahl's fish belonged to a hitherto 
undescribed species I made an examination of the specimens of 
Hippocamptis contained in the collection of the Queensland Museum, 
with the result that I discovered two other examples. One of these 
was labeled " Hippocampus sulelongatus Cast.; Moreton Bay; 
Donor, Mr. G. Watkins"; the other "Hippocampus lenis de Vis ; 
Noosa ; Donor, Mrs. Birkbeck." This latter is merely a museum 
name, no description having ever been made ; nor can I accept the 
name, since, the annular spines being well developed, it would be 
unsuitable. The Noosa specimen, however, being the largest and 
finest of the three which I have utilized in drawing up the above 
description, I have selected as the type of the species. Mr. Dahl's 
example was found attached to a branch of seaweed, which was 
coiled round the anchor line of a boat in Moreton Bay ; it is a half- 
grown male, and has been placed in the collection of the Queensland 
Amateur Fishermen's Association. 
* Hippocampus trwiaculatus Leach, Zool. Misc., p. 104=H. mannulus Cantor, 
Catal. Malay. Fish., p. 388, pi. xi. tig. 1, 1850. 
f Hippocampus sulelongatus Castelnau, Proc. Zool. & Acclim. Soc. Vict., ii, 
1873, p. 145. 
