THE STEUCTUBE AND AFFINITIES OF THE SEA-SQUIKTS. 251 
Fig. 11. Salpa {Africana, Forskalil). A young solitary zooid. After Pro- 
fessor H. Miiller. 
„ 12. Fully-developed larva (or tadpole) of Ascidia Ampulloides. After 
Van-Beneden. 
The same letters indicate corresponding parts in all the figures. 
The arrows point in the direction of water-currents. 
T. 
Test. 
st. 
Stomach. 
M. 
Mantle. 
pi. 
Placenta. 
B. 
Gill-sac. 
i. 
Intestine. 
E. 
Position of Endostyle. 
gr. ■ 
Reproductive gland. 
9- 
Ganglion. 
on. 
Oviduct. 
m. 
Mouth. 
cc. 
Ciliated cavity. 
a. 
Anus. 
A. 
Inhalent orifice. 
P. 
Exhalent orifice. 
hr. 
Hypopharyngeal hand. 
e. 
So-called eye. 
atr. 
Atrium, or respiratory cavity. 
ax. 
Axis of “caudal appendage.’ 
# 
Elaeohlast. 
hm. 
hm. Muscular hands. 
n. 
Nucleus. 
h. 
Heart. 
