OF AUSTRALIA. ] 21 
forty-four caudal ones ; these rings are strongly and trans- 
versely striated and reticulated ; on the lower surface there 
are two feeble longitudinal lines, which extend on the base of 
the tail ; the body portion of this surface has its central part 
covered with broad, rounded, striated scales. The dorsal 
begins at the sixteenth body ring, and extends over the eleven 
following ones • it has about forty-six rays and the pectorals, 
twenty-three. 
The general colour is of an olive green, with the edges of 
the body segments rather obscure. 
The total length of the specimen is seven and a-half inches. 
TETRODON GIGANTETJS. 
No scutes forming a carapace • nasal organs very conspi- 
cuous ; body broad ; nasal opening single on each side : body 
smooth. 
Head contained four times in total length ; its breadth 
eight-tenths of its length ■ the upper jaw has on each side of 
its median suture a longitudinal depression ; the nasal openings 
have each two short tentacles; the pectorals are large and 
have sixteen rays ; the dorsal is in front of the anal and has 
nine rays ; the anal seven ; the caudal is long, being equal to 
the breadth of the head, subtruncate, of seven rays. The 
body is entirely smooth, except below the throat, where it is 
covered with short tubercules. 
The general colour is of a dark green, with the lower part 
white- it is entirely covered with round white blotches- 
these are very numerous, and smaller on the back part of 
the fish than on the head ; they cover the caudal - on 
the sides of the belly and the lower part of the head the 
green colour extends in form of oblique transverse streaks- 
the fins are of a yellowish yellow; the pectorals and anal 
have a few white spots on their base. 
Length of the specimen, twenty-one inches. 
RAYA TRIGONOIDES. 
Disc rhombic, smooth, broader than long ; the anterior 
angle very obtuse, rounded ; tail once and a-half as long as 
