ai Cutieula. 

 ec Ectoderm. 

 en Endoderm. 



g Generative organs. 



h Mesenteries. 

 im Intermediary layer. 

 m Muscle-fibres. 



PLATE I. 



The lettering is the same in all the figures. 



me Mesoglcea. 



ms> Upper circular muscle. 

 ms 2 Lower circular muscle. 



o Ova. 



r Marginal spherules. 

 ar Siphonoglyphe (cesophageal groove). 



t Tentacles. 



All statements given as to magnifying powers have reference to Zeiss's system. 



Fig. 1. Zoanthus dance. 



Fig. 2. Epizoanthus elongatus. 



Fig. 3. Epizoanthus thalamophilus. 



Fig. 4. Epizoanthus stellaris. 



Fig. 5. Corticifera tuberculosa. 



Fig. 6. Corticifera lutea. 



Fig. 7. Palythoa anguicoma. 



Fig. 8. Amphianthus ornatum ; x 4. 



Fig. 9. Aulorchis paradoxa ; genital tube exposed by splitting the lip and the 

 stomatodseum. 



Fig. 10. Aidorchis paradoxa; siphonoglyphe, stomatodseuni, oral disc, and 

 mesenteries exposed on removal of about one-third of the animal. 



Fig. 11. Sphenopus pedunculatus. 



Fig. 12. Zoanthus confertus. 



Fig. 13. Liponema multiporum ; oral disc and stomatodasum evaginated. 



Fig. 14. Stephanidium schulzii ; x 30. 



Fig. 15. Epizoanthus cancrisocius. 



(Figs. 1-7, 11, 12, 15 are after Erdmann.) 



