CHORDATA 
plexities, since the sexual generations form colonies. 
Salpidae are the most striking example of this. 
is 
449 
The 
The solitary 
Fic. 262.—Doliolum denticulatum, sexual generation from the left side. 
After Herdman. 
. Muscle bands. 
.. Nerve ganglion. 
. Stigmata. 
. Subneural gland. 
. Peribranchial cavity. 
. Atrial lobes. 
. Sense organs, 
. Branchial lobes. 
. Dorsal tubercle. 
. Nerves. 
form 
chain or stolon of embryos. 
or smaller groups, and 
sexual organs. 
Fia. 
gem. 
. Atrial aperture. 
.. Ovary. 
z. Intestine. 
. Stolon of buds. 
. Heart. 
Testis. 
Branchial sac. 
Endostyle. 
Peripharyngeal band. 
pp. 
br. Branchial aperture, mouth. 
of this family gives rise by a process of budding to a 
These become detached in larger 
263.—Posterior part of the solitary form 
of Salpa democratica-mucronata, showing 
a chain of embryos nearly ready to be set 
free. After Herdman. 
Young aggregated Salpae forming the 
chain, 
. Stolon. 
. Muscle band. 
mest: 
. Visceral mass. 
each of them when mature produces 
Their ova when fertilised give rise to the 
29 
