PLATE XXIV. 
Figs. 1-8. Atopogaster elongata, n. sp. 
Figs. 9, 10. Atopogaster elongata, var. pallida, nov. 
Figs. 11-15. Atopogaster inf ormis, n. sp. 
Figs. 16-20. Morchellioides affinis, n. sp. 
ab. Abdomen of Aseidiozooid. 
ar. Prolongation of branchial sac in 
post-abdomen. 
at. Atrial aperture. 
a.z. Aseidiozooid. 
br. Branchial aperture. 
br. 1. Lobe of branchial aperture. 
COR. Csecal thickening in wall of 
stomach. 
cod. Space in mesoderm of post-abdomen. 
d. 1. Dorsal lamina. 
ec. Ectoderm. 
end. Endoderm. 
i. Intestine. 
1. Languet. 
mes. Mesoderm cells. 
m.f. Muscle fibres. 
OR. (Esophagus. 
f.ab. Post-abdomen. 
r. Eeetum. 
sg. Stigmata of branchial sac. 
sph. Sphincter. 
st. Stomach. 
t. Test. 
t.c. Test cells. 
th. Thorax of Aseidiozooid. 
t.Tc. Terminal bulb on vessel in test. 
t.m. Test matrix. 
tr. Transverse vessel of branchial sac. 
v.ap. Vascular appendage. 
Fig. 1. Colony of Atopogaster elongata; natural size. 
Fig. 2. Another colony of Atopogaster elongata; natural size. 
Fig. 3. Another colony of Atopogaster elongata; natural size. 
Fig. 4. Aseidiozooid of Atopogaster elongata, seen, from right side ; magnified (S., 1 inch). 
Fig. 5, Part of test of Atopogaster elongata; highly magnified (S., ^ inch). 
Fig. 6. Part of branchial sac of Atopogaster elongata; highly magnified (S., ^ inch). 
Fig. 7. Diagram of alimentary canal of Atopogaster elongata ; magnified (S., 1 inch, enlarged). 
Fig. 8. Transverse section of post-ahdomen of Atopogaster elongata; highly magnified (S., ^ inch). 
Fig. 9. Colony of Atopogaster elongata, var. pallida; natural size. 
Fig. 10. Part of section of test of Atopogaster elongata, var. pallida; highly magnified (S., inch). 
Fig. 11. Part of section of colony of Atopogaster inf ormis; natural size. 
Fig. 12. Part of branchial sac of Atopogaster informis ; magnified (S., 1 inch). 
Fig. 13. Part of another branchial sac of Atopogaster informis; highly magnified (S., ^ inch). 
Fig. 14. Part of dorsal lamina of Atopogaster informis, seen from the side ; magnified (S., 1 inch). 
Fig. 15. Larva of Atopogaster inf ormis ; magnified (S., 1 inch). 
Fig. 16. Colony of MoreTielUoides affinis; natural size. 
Fig. 1 7. Section through test of Morchellioides affinis, showing end of post-abdomen of Aseidiozooid and branched 
vascular appendages ending in bulbs ; magnified (S., 1 inch). 
Fig. 18. Part of branchial sac of Morchellioides affinis, showing a transverse vessel branching; magnified 
(S., 1 inch). 
Fig. 19. Branchial aperture of Aseidiozooid of Morchellioides affinis, from above, showing eight lobes; magnified 
(S., 1 inch). 
Fig. 20. Stomach of Aseidiozooid of Morchellioides affinis, showing irregular thickening of walls ; magnified 
(S., 1 inch). 
