12 JOSEPH A. CLUBB. 



m. f. mesenterial filaments, 



iiiir. mesogloea. 



m. 1. muscle lamelhv. 



or. (raopliagus. 



(le. ill. o-'sophageal invaginatiou ol' ciubrvi 



ov. ova. 



p. pseiuloacroragns. 



ji. 1). in. parieto-basilar muscle, 



s. siplioiioglyiilie. 



spli. sphincter. 



t. tentacle, 



tes. testis. 



V. verruca;. 



X. zooanthelliu. 



PLATE I. 



Fir;. 1. Farantheopsis cruentafa (Coutliouy). — Radial section of the upper part of the Ijoily-wall, passing 



through a pseudoacroragus. 

 Fui. 2. Faractis polaria, sp. n. — Drawing of the specimen (natural size). 

 Fig. 3. F. polaris. — Radial section of upper part of body-wall and sphincter muscle. 

 Fjg. 4. F. polaris. — Portion of sphincter muscle more highly magnified. 

 Fig. .">. F.jwlaris. — Horizontal section through the body-wall and mesenteries in conucctiuu with 



oesophagus. 

 Fig. G. F. polaris. — Transverse section of the wall of a teutacle. 



PLATE IL 



Fig. 7. Faractis papaver (Drayton). — Radial section through the upper part of the body-wall and sphincter 



muscle. 

 Fig. 8. F. papaver. — Transverse section of wall uf a teutacle. 

 Fig. 9. F. papaver. — Section through ovary. 

 Fig. 10. F. papaver. — Section of mesenterial filament. 

 Fig. 11. F. papaver. — Section through portion of a mesentery. 

 Fig. 12. Cystiactis anfardica, sp. n. — Drawing of specimen (natural size). 

 Fig. 13. C. antarctica. — Section of upper part of body-wall, passing through sphincter muscle. 

 Fig. 14. C. antarctica. — Horizontal section through body-wall and mesentery, with ovary. 

 Fig. 15. C. antarctica. — Section of ovary more highly magnified. 



PLATE in. 



Fig. IC). Cribrina oclonuUata (Carlgren). — Radial section through upper part of body-wall, sphincter and 



opening to ' brood ' chamber. 

 I'lO. 17. U. odoradiata. — Section through wail of a tentacle. 

 Fig. 18. C. odoradiata. — Horizontal section through body-wall and mesenteries, including the directive 



mesenteries. 

 Fig. li). U. hermapbroditica (Carlgren). — Horizontal section through body-wall and fertile mesenteries. 

 Fig. 2(t. G. hermaphroditica. — Section, more highly magnified, of genital gland. 

 Fig. 21. C. hermaphroditica. — Section through wall of tentacle. 

 Fig. 22. Rhodadinia crassicornis (0. F. Miiller). — Reproduction from a photograph of a living specimen, 



illustrating an extreme reduction of the size of the tentacles. 

 Fig. 23. li. crassicornis. — Radial section through the sphincter of a ' Discovery ' speciuuu. 



