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pointed teeth. The mandibulary lamina is lai’ge, and forms a 
transverse crescent ridge, like the teeth of a Scarm, and show- 
ing at its edge faint traces of teeth. I believe it is not 
externally visible in the living specimens. Suctorial teeth in 
numerous transverse series, those situated backwards larger than 
the others ; lingual teeth, two in number, straight, strong, and 
conical. Seven branchial openings, large, round, and bordered. 
The distance between the two dorsals and the base of the caudal 
is a little more than the diameter of the mouth, and this is equal 
to half the distance from the end of the snout to the anterior 
edge of the eye. The caudal fin is discoid, and rounded at its 
extremity. 
The colour is of a dark blue on the back, and silvery on the 
sides and belly ; on the middle of the back, a little before the 
insertion of the first dorsal, begins a space of a brilliant green, 
which extends to the tail ; fins red, bordered with black. 
Found in the Saltwater Eiver, The following are its dimen- 
sions : — 
Inches. 
Total length 205- 
Circumference of the middle of body 2 |- 
From muzzle to centre of eye 1-|- 
to first branchiostegal opening 1|- 
to last 85 
to beginning of first dorsal 12f 
Length of first dorsal If 
From first dorsal to beginning of second If 
Length of second dorsal If 
From second dorsal to beginning of caudal -f- 
From beginning of caudal to end of body If 
From end of body to anus 5 f 
A very young individual, only three inches long, has exactly the 
same form, the same dimensions, and the same dentition. 
Mr. F. G-. Waterhouse has kindly sent me, from the Torrens 
Eiver, Adelaide, a specimen of the only sort said to inhabit those 
waters, and which I felt a great desire to examine, as the typical 
specimen of Qeotria was said to have come from that Colony. This 
specimen is exactly like the one from the Saltwater Eiver, only 
ome of the suctatorial teeth are long and sharp, and this is caused 
