PLATE L X. 



LETTERING ADOPTED IN THE FIGURES. 



CM cuticle. 



ect ectoderm. 



enc. sin., . . encircling sinus. 



end., .... endoderm. 



end. sph. >»., endodermal sphincter muscle. 



incr incrustation. 



m., .... mesogloon. 



m. cH. mei., macrocnemic mesentery (the sulco- 



sulcar lateral mesentery), 



m. /., ... mesontorial filament. 



m. tph. )»., . . mesoglceal sphincter muscle. 



Fig. 



1. EpiioanthuB incrustatus (Diib. & Kor.), p. 636). Transverse section through the oesophageal region 

 of tlic column, -^ 



«* 10 



2. Epitoanthua wrightii, n. sp. (p. 651). Vortical section through the sphincter muscle, .=-.* 



2 



3. Epitoanthua couchii {J ohnst.), (p. 644). Vertical section through the sphincter muscle, -—. 



4. Epizoanthus armaceus (D. Ch.), (p. 649). Vertical section through the sphincter muscle, 



B 



5. Epizoanihua paguriphilus, Verr. (p. 641). Transverse section through a fertile mesentery, 



a* 10" 



6. Parazoantlms axinelUe (Schmidt), (p. 654). Transverse section through the oesophageal region of the 

 4 



column, 



«* 10' 



7. Farazoanthtcs axinellce. Transverse section through a fertUe mesentery. 



B' 



8. ParazoantJma dixoni, n. sp. (p. 658). Vertical section through the spliincter muscle. 



B' 



9. Farazoanfhua dixoni. Transverse section through a perfect and an imperfect mesentery, -=-. 



• These letters of magnification refer in all cases to Zeiss' system. 



