PLATE III. 
Figs. 1-8. Botrylloides fulgurale, n. sp. 
Figs. 9-14. Botrylloides perspicuum, n. sp. 
Figs. 15-18. Botrylloides perspicuum, var. ruhicundum, nov. 
Figs. 19-21. Botrylloides nigrum, n. sp. 
a. Anus. 
br. Branchial aperture. 
br.s. Branchial sac. 
c(t. Cajcum from stomach. 
d.l. Dorsal lamina. 
d.t. Dorsal tubercle. 
ec. Ectoderm. 
en. Endostyle. 
gl. Glandular tubules on intestine. 
i. Intestine. 
i.l. Internal longitudinal bar of bran- 
chial sac. 
inf. Infundibulum. 
l.v. Eine longitudinal vessels of bran- 
chial sac. 
m. /. Muscle fibre from mantle. 
n. g. Nerve ganglion. 
n.gl. Neural gland. 
a. (Esophagus. 
p.p. Peripharyngeal band. 
r. Eectum. 
sg. Stigmata of branchial sac. 
sph. Sphincter. 
st. Stomach. 
t.c. Test cells. 
t. h. Terminal bulb on vessel in test. 
t.m. Test matrix. 
tn. Tentacles. 
tr. Transverse vessel of branchial sac. 
V. Vessel in test. 
2. Prebranchial zone. 
Fig. 1. A colony of Botrylloides fulgurale; natural size. 
Fig. 2. Part of the test of Botrylloides fulgurale ; magnified (S., 1 Snch). 
Fig. 3. Part of the branchial sac of Botrylloides fidgurale, seen from the interior; magnified (S., 1 inch). 
Fig. 4. Part of a vertical section through colony of Botrylloides fulgurale, showing the anterior part of an 
Ascidiozooid and the surrounding test; magnified (S., 1 inch). 
Fig. 5. Surface view of anterior end of an Ascidiozooid of Botrylloides fulgurale ; magnified (S., 1 inch). 
Fig. 6. The reproductive organs of Botrylloides fulgurale, to show the shape; magnified (S., 1 inch). 
Fig. 7. Part of the anterior end of an Ascidiozooid of Botrylloides fulgurale, showing the tentacles, dorsal 
tubercle, &c.; highly magnified (S., ^ inch). 
Fig. 8. A vertical section through the anterior dorsal region of the Ascidiozooid of Botrylloides fulgurale, to 
show the relations of the nerve-ganglion, the neural gland, and the dorsal tubercle ; stained in 
aniline blue ; highly magnified (Z., 
Fig. 9. Part of a section through the test of Botrylloides perspicuum ; magnified (S., 1 inch). 
Fig. 10. A small portion of the same section, more highly magnified (S., inch). 
Fig. 11. A small part of the branchial sac of Botrylloides perspicuum ; magnified (S., 1 inch). 
Fig. 12. Two pigment cells from Botrylloides perspicuum ; highly magnified (Z., ^). 
Fig. 13. A transverse section through the endostyle of Botrylloides perspicuum ; highly magnified (S., -|- inch). 
Fig. 14. The alimentary canal of Botrylloides perspicuum ; magnified (S., 1 inch). 
J ig. 1 5. Part of the branchial sac of Botrylloides perspicuum, var. ruhicundum, seen from the interior ; 
magnified (S., 1 inch). 
Fig. 1C. Part of the anterior dorsal region of an Ascidiozooid of Botrylloides perspicuum, var. ruhicundum 
showing the dorsal tubercle and neighbouring parts ; highly magnified (S., J inch). 
tig. 17. The branchial sac and alimentary canal of Botrylloides perspicuum, var. ruhicundum; magnified 
(S., 1 inch). 
l‘ig. 18. Part of the test of Botrylloides perspicuum, var. ruhicundum ; magnified (S., 1 inch). 
!• ig. 10. Part of the branchial sac of Botrylloides nigrum, seen from the interior; magnified (S., 1 inch). 
big. 20. Part of another sac of Botrylloides nigrum, seen from the exterior; highly magnified (S., inch). 
b ig. 21. The alimentary canal of Botrylloides nigrum ; highly magnified (S., ^ inch). 
