MUSEUM OF comparauve zoology. 177 



EXPLANATION OF THE PLATES. 



The size of the medusa is indicated by a line at one side of the bell. A line of this 

 kind refers to the bell exclusive of appendages. 



PLATE I. 

 Fig. 1. Lizzia grata. This specimen is not fully developed, but has attached young, 



one of which is almost ready to separate from the attachment, and can 



be seen through the bell walls. 

 Fig. 2. Young bud of the proboscis of L. grata. The capsule in which it is confined, 



when attached, has been removed, and the tentacles drawn apart. 

 Fig. 3. The bell margin of L. grata as it breaks away from attachment to the parent's 



proboscis. 

 Fig. 4. Bud on the proboscis of L. grata inside the capsule. 

 Fig. 5. Tentacles around the mouth of adult L. grata, which has one bud from the 



proboscis. 

 Fig. 6. Young L. grata ]\\?,t before the rupture of the connection with the parent. 

 Fig. 7. Very young L. grata with infolded tentacles. 

 Fig. 8. Gcmmaria gemmosa (adult). Only one tentacle is represented. 

 Fig. 9. G. gemmosa (natural size). 

 Fig. 10. Tentacular bulb of G. gemmosa. 

 Fig. 11. Tentacular knobs of (r. gemmosa. 

 Fig. 12. Aboral view of G. gemmosa. 

 Fig. 13. Sphoerula formosa (young ?). 



PLATE II. 



Fig. 1. Stomatoca apicata (a.dca\% Only a single tentacle is represented. 



Fig. 2. Young of Dinematclla cavosa. 



Fig. 3. Apex of the bell of D. cavosa. 



Fig. 4. Base of the proboscis of S. apicata (male?). 



Fig. 5. Young of Trachyncma digitale. 



Fig. 6. View of the same from oral side. One tentacle represented. 



Fig. 7. Part of the bell rim of T. digitale (adult) showing parts of two chymiferous 



tubes and of the tentacles. 

 Fig. 8. Tentacular bulb of Cunina discoides. 

 Fig. 9. Four stages in the development of the egg of S. apicata. The lowest figure 



is the ciliated planula. Size of planula ^2 inch. 



PLATE III. 

 Fig. 1. Turris episcopalis (adult). One tentacle figured. 

 Fig. 2. Young of T. rpiscnpaUs. 



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