MR. T. H. HUXLEY ON THE AFFINITIES OF THE MEDUSAE. 
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Fig. 7- A single buccal tentacle much magnified. 
Fig. 8. A portion of the marginal canal with a tentacle and two marginal corpuscles. 
Fig. 9. Portion of the marginal canal (a) with young tentacle (6), and a marginal 
vesicle containing two corpuscles, each inclosed within a delicate cell- wall. 
Fig. 10. A marginal vesicle highly magnified; the two corpuscles do not appear to 
have attained their full development, as they refract less, and the cell 
appears more opake. 
Oceania ? 
Fig. 11. Lateral view of the animal. 
Fig. 11 a. Vertical section. 
Fig. 12. Part of the under surface of the disc. 
a. Marginal membrane. 
h. Canals and generative organs, 
c. Common cavity. 
Fig. 13. Part of the membrane surrounding the mouth. 
Fig. 14. The edge of this much magnified. 
Fig. 15. Part of the margin of the disc much enlarged. 
a. Marginal membrane. 
h. Canal and generative organs. 
c. Tentacle. 
d. Marginal corpuscles. 
e. Circular canal. 
Fig. 16. Portion of the ovarium so folded as to have its inner membrane («) out- 
wards. 
Fig. 17 . Sectional view of the ovarium. 
a. Inner membrane. 
h. Outer membrane. 
c. Ovum. 
d. Germinal vesicle. 
e. Germinal spot. 
PLATE XXXVIII. 
Phacellophora ? 
Fig. 18 . View of a segment of the under surface. 
a. Marginal vesicles. 
h. Tentacles in this individual very much shorter than usual. 
c. Ovary or testis. 
d. Buccal membrane. 
Fig. 18 a. Vertical section. 
3 K 2 
