14 
On the Callorynclius Australis. 
Art. II. On the Callorynclius Australis. By Edmund 
C. Hobson, M.D. 
The Chimeras are near relations of the sharks and 
rays: their general form, and the position of the 
fins, are like the sharks ; blit in many of their anatomical 
relations they ditfer widely. The branchial openings in 
the rays and sharks are five in number: in the Chimera 
one vent only is found—on each side of the neck. The 
peripheral edge of the branchia are not attached, as in 
the rays and sharks : they have a vestige of an oper¬ 
culum, concealed under the skin. The jaws are less 
developed than in the true shark ; and the teeth are not 
prehensile, as in these rapacious fish. In the disposition 
and form of the teeth, they resemble the rays; and, as 
we shall hereafter see, in many other points of their 
internal structure. 
The Chimera of the northern hemisphere (Chimera 
Arctica) is the only species found on the northern side of 
the equator; and it is vulgarly denominated the King of 
the Herrings. The muzzle in this fish is simply conical, 
and its length is from two to three feet. 
The other species or subgenus is the Chimera Calloryn - 
chus Antarctica. The little already known of this beauti¬ 
ful and singularly formed fish, render an investigation of 
its anatomy and habits highly interesting. The subject of 
the following observations was taken in the Derwent, at 
Roseneath, where, about the month of November, it is 
very abundant: whether it remains longer in the river, 
or where it goes on leaving the estuaries of the coast, is 
as yet unknown. Although numbers come into the river 
at the same time, yet you rarely observe more than two 
together. I am informed by my friend Mr. Ronald 
Gunn that he has taken them in the Tamar, near Whirl¬ 
pool Reach. 
