PLATE XIX. 
Cystodytes draschii, n. sp. 
ad.p. Adhering papilla. 
at. Atrial apertiie. 
eii. Endostyle. 
l. s. Lower surface of colony. 
m. Mantle. 
m. h. Muscle band in mantle. 
sph. Sphincter. 
t.c. Test cells. 
t.c'. Modified test cells. 
th. Thorax. 
t.m. Test matrix. 
at. si. Atrial siphon. 
hi. Bladder cell. 
hr. Branchial aperture. 
hr.s. Branchial sac. 
ma/r. Free margin of colony. 
hr. si. Branchial siphon. 
cap. Calcareous capsule around Ascidio- 
zooid. 
n.g. Nerve ganglion. 
s.o. Sense organ. 
sp. Calcareoxis spicule in test. 
tn, tn'. Tentacles. 
u.s. Upper surface of colony. 
Fig. 1. Qolonj of Cystodytes draschii ; &\zQ. 
Fig. 2. Part of section through test of Cystodytes draschii ; highly magnified (S., ^ inch). 
Fig. 9. Part of mantle of Cystodytes draschii; highly magnified (S., ^ inch). 
Fig. 10. Branchial siphon, &c., of Cystodytes draschii; highly magnified (Z., 
Fig. 11. Anterior end of Ascidiozooid of Cystodytes draschii; magnified (S., 1 inch). 
Fig. 12. Tentacles of Cystodytes draschii; magnified (8., ^ inch, reduced). 
Fig. 13. Part of a tentacle of Cystodytes draschii; highly magnified (Z., 
Fig. 14. Tip of a tentacle of Cystodytes draschii; highly magnified (Z., ^3^). 
Fig. 15. Tailed larva of Cystodytes draschii; magnified (S., 1 inch). 
Fig. 3. Part of section through colony of Cystodytes draschii, showing relation of 
Ascidiozooid to test and calcareous spicules ; magnified (8., 1 inch). 
Fig. 4. Part of vertical section through colony of Cystodytes draschii, showing free 
margin, &c.; slightly enlarged. 
Fig, 5. Ascidiozooid of Cystodytes draschii; natural size. 
Fig. 6. Two calcareous spicules from the test of Cystodytes draschii; highly magnified 
(8., I inch). 
Fig. 7. Part of calcareous capsule showing overlapping spicules ; magnified (8,, 1 inch). 
Fig. 8. Connective-tissue cells from mantle of Cystodytes draschii; highly magnified 
