PLATE XX. 
Cystodytes philippinensis, n. sp. 
ab. Abdomen of Ascidiozooid. 
at. Atrial aperture. 
br. Branchial aperture. 
bl. Bladder cell. 
br.si. Branchial siphon. 
cap. Calcareous capsule around Ascidio- 
zooid. 
l. s. Lower surface of colony. 
m. Mantle. 
mar. Free margin of colony. 
sg. Stigmata of branchial sac. 
sp. Calcareous spicule in test. 
t. Test. 
t.c. Test cells. 
t.c'. Modified test cells. 
th. Thorax of Ascidiozooid. 
t. m. Test matrix. 
tr. Transverse vessel of branchial sac. 
u. s. Upper surface of colony. 
Fig. 1. Colony of Cystodytes philippinensis ; na^tmal size. 
Fig. 2. Another colony of Cystodytes philippinensis ; natural size. 
Fig. 3. Vertical section of part of colony of Cystodytes philippinensis', slightly enlarged. 
Fig. 4. Calcareous spicules from test of Cystodytes philippinensis ; A, from side, B, from 
edge ; highly magnified (S., ^ inch). 
Fig. 5. Part of section of colony of Cystodytes philippinensis, showing relation of 
Ascidiozooid to test and spicules ; magnified (S., 1 inch). 
Fig. 6. Section of test of Cystodytes philippinensis ; highly magnified (S., inch). 
Fig. 7. KnteinoxpQxi of k.Beidiiozoo\dLoi Cystodytes philippinensis', magnified (S., 1 inch). 
Fig. 8. Part of branchial sac of Cystodytes philippinensis ; magnified (S., 1 inch). 
Fig. 9. Part of test from lower surface of colony of Cystodytes philippinensis ; magnified 
(S., 1 inch). 
Fig. 10. Surface layer of test of Cystodytes philippinensis, seen from interior, showing 
branchial apertures ; magnified (S., 1 inch). 
Fig. 11. Diagrammatic vertical section of colony of Cystodytes philippinensis, 
arrangement of Ascidiozooids and their relation to calcareous capsule 
magnified. 
Fig. 12. Part of vertical section of upper surface of colony of Cystodytes philippinensis, 
showing structure of test ; magnified (S., 1 inch). 
