Corzsso,—ÓOn the Genus Callorhynehus. . 999 
never seen before; I knew it was of the genus Callorhynchus, and, as I 
thought, distinct from C. antarcticus (the only species of that genus then 
known to me), so I took a sketch drawing of it, with notes of its dimensions, 
ete., which I now give. 
Callorhynchus dasycaudatus, mihi. 
Total length, 8ft. 8in.; girth, (belly) 1ft. 5in.; length of pectoral fin, 9in.; 
first dorsal fin, 5in.; of attached bony ray, 7in.; length of tail, from angle 
in upper surface, 19in. ; length from snout to anterior base of first dorsal 
fin., 94in.; the bony ray in front of the first dorsal fin is partly separated 
from that fin, it is a little curved, and barbed slightly on the posterior edge; * 
the extremity of the tail is free and feathered, which. being such a great 
peculiarity and so very characteristic of this species, has given rise to its 
pecific name, Whole fish silvery white, but highly iridescent; the fins of 
dark grey colour. It had no teeth, only palatal bones; a crayfish was 
found in its maw, Be 
In its produced whip-like tail and barbed dorsal spine this species 
approaches more nearly toits northern congener, Chimera arctica, Linn., 
formerly the type of the genus, before that Callorhynchus was separated from 
it by Cuvier. 
Captain Hutton, in the work above cited (p. 74), gives as a character of 
this genus, ‘extremity of the tail distinctly turned upwards:" I scarcely 
understand this; such is certainly not the case in the one species mentioned 
by him as belonging to these seas, C. antarcticus; neither does any such char- 
acter belong to C. australis,—another of our species, which I have also seen, 
Both of those species also differ widely from C. dasycaudatus,in the very 
. large size of their pectorals, which overlap the base of their ventrals, 
Drawings of the tails of those two species I also give in the subjoined plate. 
I also note that Dr. Richardson, in a paper on some new Tasmanian 
fishes, read before the Zoological Society in 1839, has another new species, 
C. tasmanius, which may also be found here in our seas; I have, however, 
never seen it. It differs from those two species last mentioned in the size 
of its pectorals; in which respect it approaches to C. dasycaudatus. Dr. 
Richardson gives the following characters to distinguish it from C. antarcticus 
(probably at that time C. australis was unknown to him)—* pinnis pectoralibus 
ad ventrales haud attingentibus; pinná dorsi secundá pone ventrales incipienti, 
ante lobum anteriorem inferiorem pinne cauda desinenti." And then he adds : 
“ This species agrees with the Callorhynchus smythi of Benne, figured in 
Beechy's Zoological Appendix, in the distance between the pectorals and 
ventrals, but is so unlike that figure in other respects that it is impossible to 
assign it to that species.” Of this last mentioned species (C. smythi), I 
know no more than what I have here quoted; should it be found in our 
seas, then, we may probably count on having five species of this genus, 
