OF AUSTRALIA. 95 
caudal ; it is rather long, and formed of eleven rays, the first 
of which is short. The tail is nearly equal in length to the 
breadth of the back ; it is truncated, and formed of nine rays 
with a few shorter ones on the side • it is considerably longer 
than the distance that separates it from the dorsal ; the anal 
is inserted below the dorsal, and extends a little further back- 
wards. It is received in a rather deep longitudinal cavity of 
the tail, which only extends to its length ; it is formed of six 
rays ; the pectorals are large, almost square, of eighteen 
rays. 
After having been in liquor, it appears to have been yellow, 
with the upper parts of a slaty blue ; fins yellow. It presents 
no trace of spots whatever. 
Length three and a half inches. 
Port Darwin. Dedicated to the greatest naturalist of the 
age. 
ELLERYA. 
The extraordinary little fish on which I propose forming 
this genus, presents an assemblage of characters such as to 
leave me in complete uncertainty as to the family to which it 
belongs ; the complete absence of spines to its fins places it 
amongst the Anacanthini, but its general form does not allow 
it to be placed in any of the natural group this order contains. 
The general appearance is something like that of some 
Coryphama but shorter ; its form is very compressed, oval, and 
almost truncated in front ; the upper part of the head is very 
convex ; the mouth saillant, and the lower part forming a chin ; 
the teeth are small, numerous, sharp, and on one series on each 
jaw ; the eye is of moderate size ; the opercular pieces simple; 
the body naked, finely puncturated, with the muscular flaxes 
well-marked ; the dorsal is unic ; the caudal rather large, 
rounded ; the anal well developed ; the ventrals placed a little 
behind the insertion of the pectorals. 
ELLERYA UNICOLOR. 
Height of body the greatest over the insertion of the 
pectorals, where it is contained a little over twice in the length 
