PLATE XXIX. 
Figs. 1-5. Amaroucium glohosum, n. sp. 
Fig. 6. Amaroucium variahile, var. tenerum, nov. 
Figs. 7-12. Amaroucium variabile, n. sp. 
Figs. 13-15. Amaroucium recumhens, n. sp. 
at. Atrial aperture. 
at.l. Atrial languet. 
hr. Branchial aperture. 
en. Endostyle. 
h.m. Horizontal membrane of bran- 
chial sac. 
i. Intestine. 
l.v. Fine longitudinal vessels of 
cbial sac. 
CB. (Esophagus. 
'.ab. Post-abdomen, 
r. Eectum. 
st. Stomach! 
t.c. Test cells. 
! th. Thorax. 
\ t.m. Test matrix. 
I tr. Transverse vessel of branchial sac. 
t.v. Spermatic vesicles. 
I v.ap '. . Kudimentary vascular appendages 
i v.d. Vas deferens. 
Fig. 1. Large colony of Amaroucium globosum; natural size. 
Fig. 2. Smaller colony of Amaroucium globosum ; natural size. 
Fig. 3. Part of branchial sac of Amaroucium globosum, from the smaller colony ; 
magnified (S., 1 inch). 
Fig. 4. Ascidiozooid of Amaroucium globosum, seen from left side ; magnified (S., 1 inch). 
Fig. 5. Part of male reproductive organs of Amaroucium globosum ; highly magnified 
(S., i inch). 
Fig. 6. Colonies of Amaroucium variabile, var. tenerum; natural size. 
Fig. 7. Colony of ^marowcmm ; natural size. The specimen figured belonged 
to the brown variety. 
Fig 8. Section of the test of Amaroucium variabile; highly magnified (S., ^ inch). 
This section was taken from a specimen of the brown variety. 
Fig. 9. Ascidiozooid of Amaroucium variabile, seen from right side ; magnified 
(S., 1 inch). 
Fig. 10. Anterior end of Ascidiozooid of Amaroucium variabile, seen from right side, 
showing apertures and atrial languet; magnified (S., 1 inch, enlarged). 
Fig. 11. Transverse section of post-abdomen of Amaroucium variabile; magnified 
(S., 1 inch). 
Fig. 12. Transverse section of stomach of Amaroucium variabile, showing numerous 
folds ; highly magnified (S., ^ inch). 
Fig. 13. Qolonj oi Amaroucium recumbens ; natural size. 
Fig. 14. Part of branchial sac of Amaroucium recumhens; magnified (S., 1 inch). 
Fig. 15. Ascidiozooid of Amaroucium recumhens, seen from right side; magnified 
(S., 1 inch). 
