207 
TETRODON HAMIETONT. 
Tetrodon Hamiltoni, Bichard., Erehus ^ Terror, p. 63, pi. 39. 
{Toad Fish.) 
The dorsal is formed of nine rays, and the candal also of nine ; 
the anal of eight ; and the pectorals of fifteen. The body is covered 
with small pores, and is pretty smooth. 
The upper parts are green, marbled with a darker tinge ; the 
lower white ; fins of a greenish yellow ; eye of a yellowish green, 
with an interior bright red line. 
The usual size is from four to five inches, some adults measure 
up to nine. Very common. It sometimes goes up the river to 
Melbourne. 
TETEOnOIf niSPIDETS. 
Tetrodon Hispidus, Lin. Si/st. Nat., vol. i., p. 411. 
Lacep. vol. i., p. 487, pi. 24, fig. 1. 
JBloch, pi. 142. 
(Toad Fish.) 
Dorsal of eleven rays ; caudal rather emarginated, of eleven 
rays ; anal of six ; pectorals of thirteen. 
The entire body is covered with very minute spiny asperities 
upper parts of a greyish green, the lower of a pinky white ; 
numerous large irregular brown blotches on the upper part ; lips 
rosy ; dorsal white, with its internal half green ; caudal with a 
green tinge ; anal white ; pectorals of a light green, with a pink 
tinge on its external edge ; eye blue, with a lower brown external 
line. 
AEACAJSTA. 
Separated from Ostracion by G-rey, on the character of the 
carapace not being closed behind the anal fin. This is easily 
seen in preserved specimens, but does not appear externally in 
fresh ones. These fish are mostly Australian, and are adorned 
with beautiful colours. 
AEACANA AM03KA. 
Carapace with five ridges, the abdomen forming an inferior 
one ; spines short, thiclf, conical, blunt, and not arched, placed one 
above the orbit, and directed externally ; two on each side of the 
back directed posteriorly ; below these are others much shorter 
