X LIST OF PLATES. 



X. — 1. Lophohelia prolifera. 2. Peachia triphylla. 3. Sphenotro- 

 chus Wrightii. 4. S. Macandrewanus. 5. Zoanthus 

 Couchii. 6. Paracyathus Taxilianus. 7. P. pteropus. 

 8. P. Thulensis. 9. Hoplangia Durotrix. 10,11. Bala- 

 nophyllia regia. ] 2, 13. Caryophyllia Smithii. To face. p. 308 



XI. — Anatomical details. 1. Ideal derai-section of a Sagartia. 

 a. septum ; b. septal foramen ; c. stomach ; d. liver ; 

 e. ovarian mesentery ; /. ovary; g. craspedal mesentery ; 

 h. craspedum ; i. acontia. 2. Fragment of craspedum 

 (S. bettis) with its mesentery (magnified). 3. The same 

 craspedum under pressure (more highly magnified). 

 4. Fragment of acontium (S. bellis). 5. Portion of 

 column containing cinclides (A. dianthus). k: fully open ; 

 /. slightly open ; m. closed. 6. Chambered cnida (Ca- 

 ryophyllia) before discharge. 7. Chambered cnida (Tealia) 

 discharged, n. ecthorpeum ; o. strebla ; p. pterygia, 



8. Chambered cnida discharging, showing the ecthoraaum 

 in process of evolving. (X.B. — The strebla and pterygia 

 are here omitted, for the sake of greater clearness.) 



9. Tangled cnida (Corynactis). 10. Spiral cnida (Tealia) 

 discharging. 11, 12. Globate cnidre (S. parasitica). 



q. peribola 348 



XII. — Magnified Figures. 1. Phellia picfca. 2. Zoanthus sulcatus. 

 3. Edwardsia carnea. 4. Caryophyllia (tentacle). 5. Zo- 

 anthus Alderi. 6. Halcampa microps. 7. Gregoria 

 fenestrata. 8. Phellia murocincta 358 



