20 
On the Callorynchus Australis. 
character, and may either have some vivifying influence 
on the ova, or serves to form a nidus in which they are to 
float securely in the tempestuous ocean. An organ ana¬ 
logous is observed in the rays. 
Organs of reproduction .—The reproductive functions 
of the Callorynchus appear to be highly active from the 
size of the testes in the male; and there is no doubt a 
corresponding development in the ovary of the female. 
The testes are of an elongated form, extending from 
the cloaca to the diaphragm, on each side of the spine. 
The tubali arc large, and resemble those of the organs in 
the ophidian reptiles. At the upper part of the extrem¬ 
ity, the testis is closely connected with a kidney-shaped 
body, which lies to its outer side : this is a reddish look¬ 
ing, smooth, kidney-shaped body, with a white spot in 
the middle, resembling a cicatrix ; it is highly supplied 
with blood-vessels; and is granular in its structure, 
much resembling the ova in a very early state. I exam¬ 
ined it carefully to find a duct, supposing it to correspond 
to the W oolfian body ; but I was unable to discover any 
outlet: its use, and the minute anatomy, is as yet un¬ 
known. 
The tubali terminate in the vas differens, which is short, 
and soon dilates into two large vesiculae seminales, of up¬ 
wards of two inches long, of a pale sea-green colour, 
which is derived from their contents, consisting of a 
mucous secretion, in which are suspended the sacs that 
contain spermatory oil. They are, apparently, of a com¬ 
pound character. The orifices of the vesicula* terminate 
in the cloaca, very near its orifice, and anterior to the 
ureters. At the extremity of the cloaca there is a small 
sonical projection, which is slightly grooved, and appears 
to be an organ of excitement. 
* 
