PLATE XXIII. 
Figs. 1-6. Atopogaster gigantea, n. sp. 
Figs. 7-13. Atopogaster aurantiaxia, n. sp. 
hi. Bladder cell. 
hr. Branchial aperture. 
ep. Band of thickened epithelium 
connecting languets on dorsal 
lamina. 
m.f. Muscle fibres. 
CB. (Esophagus. 
i. Intestine. 
1. Dorsal languet. 
sg. Stigmata of branchial sac. 
st. Stomach. 
■ t.c. Test cells. 
t.k. Terminal bulb on vessel in test. 
h. m. Horizontal membrane of branchial 
sac. 
p.ah. Post-abdomen. 
p.e. Mass of pigment cells. 
r. Kectum. 
t.m. Test matrix. 
tr. Transverse vessel of branchial sac. 
V. Vessel in test. 
Fig. 1. Colony of Atopogaster gigantea; one half natural size. 
Fig. 2. Part of surface of Atopogaster gigantea, showing systems ; slightly enlarged. 
Fig. 3. Ascidiozooid of Atopogaster gigantea, from left side; magnified (S., 1 inch). 
Fig. 4. Part of branchial sac of Atopogaster gigantea ; magnified (S., 1 inch). 
Fig. 5. Branchial siphon and lobes of Atopogaster gigantea; magnified (S., 1 inch). 
Fig. 6. Larva of Atopogaster gigantea; magnified (S., 1 inch). 
Fig. 7. Qoloaj oi Atopogaster aurantiaca ; natural size. 
Fig. 8. Branchial siphon and lobes of Atopogaster aurantiaca; magnified (S., 1 inch). 
Fig. 9. Section of test of Atopogaster aurantiaca; highly magnified (S., inch). 
Fig. 10. Part. of branchial sac of Atopogaster aurantiaca; magnified (S., 1 inch). 
Fig. 11. Part of dorsal lamina of Atopogaster aurantiaca, from the side, showing Ian 
guets ; magnified (S., 1 inch). 
Fig. 12. Part of dorsal lamina of Atopogaster aurantiaca, from the front, showing Ian 
guets, &c. ; magnified (S., 1 inch). 
Fig. 13. Larva of Atopogaster aurantiaca ; magnified (S., 1 inch). 
