PLATE IX. 
Colella jpedunculata, Quoy and Gaimard, 
hi. Bladder cells. 
hr. Branchial aperture. 
hr.s. Branchial sac. 
ec. Ectoderm. 
i. Intestine. 
emh. A bud. 
e)i. Endostyle. 
n.g. Nerve ganglion. 
n.t. Neural canal. 
0. Ovary. 
p. hr. Peribranchial cavity. 
sg. Stigmata of branchial sac. 
st. Stomach. 
t.e. Test cells. 
t.m. Test matrix. 
tr. Transverse vessel of branchial sac. 
V. Vessel in test. 
v.ap. Vascular appendage. 
v.ap.c. The canal of the vascular append- 
age. 
Fig. 1. Transverse section through part of peduncle, showing the structure of the test 
and the vascular appendages ; highly magnified (S., inch). 
Fig. 2. Part of a transverse section, showing the cavities of vascular appendages con- 
taining proliferating blood-corpuscles ; highly magnified (S., ^ inch). 
Fig. 3. Part of a longitudinal section, showing a young bud projecting from a vascular 
appendage ; highly magnified (S., ^ inch). 
Fig. 4. Part of a transverse section, showing a young bud emerging from a vascular 
appendage ; highly magnified (S., ^ inch). 
Fig. 5. Part of a longitudinal section, showing a young bud lying im the test alongside 
a vascular appendage ; highly magnified (S., ^ inch). 
Fig. 6. Part of a longitudinal section, showing a young bud just becoming separated 
from the vascular appendage ; highly magnified (S., ^ inch). 
Fig. 7. Transverse section of a young bud, showing the division of the archenteron ; 
highly magnified (S., ^ inch). 
Fig. 8. Transverse section of an older bud, showing the branchial sac, peribranchial 
cavities, neural canal, &c.; highly magnified (S., ^ inch). 
Fig. 9. Longitudinal section of an advanced bud ; highly magnified (S., ^ inch). 
Fig. 10. Longitudinal section of a younger bud; highly magnified (S., ^ inch). 
Fig. 11. Part of an advanced bud, showing the interior of the branchial sac with 
stigmata; highly magnified (S., ^ inch). 
Fig. 12. Longitudinal section of a very advanced bud or young Ascidiozooid, showing 
all the important organs ; highly magnified (S., inch). 
