PLATE XV. 
Figs. 1-13. Colella pulchra, n. sp. 
Figs. 14-17. Colella ramulosa, n. sp. 
a. Anus. 
ap. Appendage from the abdomen of 
the Ascidiozooid. 
ap. Atrial aperture. 
bl. Bladder cell. 
br. Branchial aperture. 
br.si. Branchial siphon. 
c. rn. Mass of cells of a nervous nature(?) 
d. l. Dorsal lamina, 
m. Bud. 
en. Endostyle. 
h.m. Horizontal membrane of bran- 
chial sac. 
i. Intestine. 
1. Dorsal languet. 
l.v. Fine longitudinal vessels of bran- 
chial sac. 
CB. (Esophagus. 
ot. Pigmented sense organ. 
ov. Ovary. 
p.c. Pigment cells. 
r. Rectum. 
sg. Stigmata of branchial sac. 
st. Stomach. 
t. Test. 
t.c. Test cells. 
t.m. Test matrix. 
tr. Transverse vessels of branchial sac. 
Uv. Spermatic vesicles. 
u. Urochord. 
v.ap. Vascular appendage. 
v.d. Yas deferens. 
Fig. 1 . Colony of Colella pulchra ; natural size. 
Fig. 2 . Young colony of Colella pulchra ; natural size. 
Fig. 3 . Part of brancFial sac of Colella pulchra ; magnified (S., 1 inch). 
Fig. 4. Ciliated cells from stigmata of Colella pulchra ; highly magnified (Z., 3 ^). 
Fig. 5. Part of branchial sac and dorsal lamina of young Ascidiozooid of Colella 
pulchra; highly magnified (S., -g- inch). 
Fig. 6 . Part of the surface of the colony of Colella pulchra, showing arrangement of 
Ascidiozooids ; magnified (S., 1 inch). 
Fig. 7. Ascidiozooid of Colella pulchra, seen from left side; magnified (S., 1 inch). 
Fig. 8 . Pigmented appendage from region over stomach of Ascidiozooid of Colella 
pulchra; highly magnified (Z., ^i^). 
Fig. 9. Part of peduncle of Colella pulchra ; magnified (S., 1 inch). 
Fig. 10 . Transverse section of peduncle of Colella pulchra ; magnified (S., 1 inch). 
Fig. 11 . Part of a transverse section through the peduncle of Colella pulchra; highly 
magnified (S., inch). 
Fig. 12 . Tailed larva of Colella pulchra ; magnified (S., 1 inch, enlarged). 
Fig. 13. Part of tailed larva of Colella pulchra ; highly magnified (S., ^ inch). 
Fig. 14. Colony of Colella ramulosa; natural size. 
Fig. 1 5. Branched peduncle of another colony of Colella ramulosa ; natural size. 
Fig. 16. Part of the branchial sac of Colella ramulosa; magnified (S., 1 inch). 
Fig. 17. The Ascidiozooid of Colella ramulosa, seen from the left hand side; magnified 
(S., 1 inch). 
