PLATE LXIV. 



LETTERING ADOPTED IN THE FIGURES. 



eii., .... cuticle. 



d. III. sph., . . double mesogloeal sphincter muscle. 



ect., .... ectodenn. 



ect. can., . . . ectodermal caiiitl. 



end., .... endoderm. 



end. b endodermal bay. 



end. enii!., 

 end. m., . 



I. m., 



endodermal canaliculus, 

 endodermal circular muscle of ten- 

 tacle, 

 food-ball (?). 

 longitudinal muscle. 



IK., .... mesogloea. 



mes. can., . . mesenterial canal. 



mes. sin., . . mesenterial sinus. 



m. /., ... mesenterial filament. 



«. c, . . . ■ nerve-cell. 



nem., .... nematocyst. 



ass., . . . . oesophagus. 



ov., .... ovum. 



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



r. ect., . . reflected ectoderm. 



ep sperm-ceU (testis). 



<., tentacle. 



z zooxanthella. 



Fig. 



2 



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



2. Zoanthus coppingeri. Transverse section through the wall of a tentacle. 



I)' 



i. Zoanthus coppingeri. Vcrticle 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 blue 



' «* 6' 



4.. Zoanthus coppingeri. Transverse section through a perfect mesenteiy, -5-. 



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



a* 8 



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



2 

 ectoderm, — . 

 C 



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



of the mesenterial filament, j^. 



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



of the mesenterial filament, -pj. 



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



2 

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



