PLATE XVII. 
Figs. 1-11. Colella murrayi, n. sp. 
Figs. 12-14. Colella murrayi, var. rubida, nov. 
at. Atrial aperture. 
bl. Bladder cell. 
br. Branchial aperture. 
en. Endostyle. 
g. Reproductive organs. 
i. Intestine. 
l.v. Fine longitudinal vessels of bran- 
chial sac. 
m. Mantle. 
ce. (Esophagus. 
'p.c. Mass of pigment cells. 
r. Rectum. 
sg.c. Ciliated cells bounding stigmata 
of branchial sac. 
st. Stomach. 
t.c. Test cells. 
t.m. Test matrix. 
tr. Transverse vessel of branchial sac. 
tn, tn'. Tentacles. 
tv. Spermatic vesicles. 
v.ap. Vascular appendage. 
v.d. Vas deferens. 
Fig. 1. Colony of Colella murrayi; natural size. 
Fig. 2. Upper end of colony of Colella murrayi; slightly enlarged. 
Fig. 3. Part of branchial sac of Colella murrayi; magnified (S., 1 inch).' 
Fig. 4. Part of surface of Colella murrayi, to show arrangement of pigment masses ; 
magnified (S., 1 inch). 
Fig. .5. Part of transverse section of peduncle of Colella murrayi; magnified (S., 1 inch). 
Fig. 6. The outer part of a transverse section through the peduncile of Colella murrayi ; 
highly magnified (S., ^ inch). 
Fig. 7. The central part of a transverse section of the peduncle of Colella murrayi ; 
highly magnified (S., inch). 
Fig. 8. Part of transverse section of outer part of head of Colella murrayi, showing 
arrangement of Ascidiozooids and pigment masses ; highly magnified 
(S., ^ inch). 
Fig. 9. Ascidiozooid of Colella murrayi, seen from left side ; magnified (S., 1 inch). 
Fig. 10. Transverse section of abdomen of Ascidiozooid of Colella murrayi ; magnified 
(S., 1 inch). 
Fig. 11. Part of male reproductive organs of Colella murrayi; highly magnified 
(S., i inch). 
Fig. 12. Colony of Colella murrayi, var. rubida; natural size. 
Fig. 13. Part of circle of tentacles of Colella murrayi, var. rubida; highly magnified 
(S., i inch). 
Fig. 14. Part of branchial sac of Colella murrayi, var. rubida; highly magnified 
(S., I inch). 
