PLATE LXIV. 



LETTERING ADOPTED IN THE FIGURES. 



eu., . . . . cuticle. 



d. III. sp/t., . . double mesoglceal sphincter muscle- 



ect., .... ectoderm. 



ect. can.., . . . ectodermal canal. 



end., .... endoderm. 



end. b., . . . eudodermal bay. 



end. caul., . . endodermal canaliculus. 



end. in., . . . eudodermal circular muscle of ten- 

 tacle. 



/.*.,. . . . food-ball (?). 



l.m., . . . longitudinal muscle. 



mesogloea. 



mes. can., . . mesenterial canal. 



mes. sin., . mesenterial sinus. 



m. /., ... mesenterial filament. 



«.«.,. . . . nerve-ceU. 



iiein., .... nematocyst. 



CCS., .... oesophagus. 



or., . . . ovum. 



p. b. in., . . parieto-basilar muscle. 



r. ect., . . . reflected ectoderm. 



sp sperm-oeU (testis). 



t., tentacle. 



«., .... zooxanthella. 



Fig. 

 1. 



Zoanthus coppingeri, n. sp. (p. 676). Transverse section through the body-wall, 



Zoi 



coppingeri. Transverse section through the wall of a tentacle, 



B' 



Zoanthus coppingeri. Verticle section through the half of a polyp ; slightly diagrammatic ; the 

 ectoderm, ectodermal canals, mesogloea, mesenteric canals, gonads, and sphincter muscle are 



3 



coloured red ; the endoderm and the endodermal canals are coloured tlue, 



a* 6 



4. Zoanthus coppingeri. Transverse section through a perfect mesentery, -^. 



Q 



5. Zoanthus macgillivrayi, n, sp, (p. 680). Vertical section thi'ough a portion of a polyp, . 



a' 8 



6. Zoanthus macgillivrayi. Transverse section through part of a perfect mesentery, with reflected 



2 

 ectoderm, — . 



7. Zoanthus macgillivrayi. Transverse section through a perfect mesentery, showing the upper portion 



of the mesenterial filament, — . 



8. Zoanthus macgillivrayi. Transverse section through a perfect mesentery, showing the lower portion 



of the mesenterial filament, — . 



icus, n. sp. (p. 684). Transverse section through two perfect and one imperfect 



2 

 mesenteries in the oesophageal region ; also showing an endodermal bay, -— . 



