The outer coat of the testis is called the tunica albuginea.
The testis of the male lies in the thorax, just below the heart.
Spermatozoa originate in the testis as cells, which are filled with granules.
The number of segmental tubes connected with the testis varies very greatly.
In the case of Reptilia the anterior two or three segmental tubes in the region of the testis probably have this function.
In Birds a connection between the Wolffian body and the testis appears to be established as in the other types.
In Protopterus the vasa efferentia are reduced to a single one on each side at the extreme hind end of the testis.
This wound healed without fungous growth from the remaining portion of the testis.
The hermaphroditic specimen was of some interest, since the ovary and testis both seemed to be enlarged.
In reptiles and birds they are long lobulated bodies lying close to the testis or ovary and receiving an adrenal portal vein.