TENNENT 



PLATE 1 



1. Toxopneustes skeleton and pluteus. 24 hours. 



2. Toxopneustes, half skeleton. Side view. 24 hours. 



3. Hipponoe skeleton. 24 hours. 



4. Hipponoe skeleton. 4 days. 



5. Moira skeleton. 15J hours. (McGlone.) 



6. Outline Moira pluteus. 24 hours. (McGlone.) 



7. Moira skeleton. 29 hours. 



8. Outline Arbacia pluteus. 40 hours. 



9. Arbacia skeleton. 40 hours. Ends of arms not shown. 



10. Mellita, half skeleton. 23 hours. 



11. Mellita skeleton. 48 hours. Ends of arms not shown. 



12. Outline Mellita pluteus. 84 hours. 



13-14. Toxopneustes 9 X Moira cJ 1 . Half skeleton. 42 hours. 



15. Toxopneustes 9 X Moira (?. Side view. 48 hours. 



16. Toxopneustes 9- X Moira tf. Whole skeleton. 48 hours. 



17. Toxopneustes^ X Moira J 1 . 62 hours. 



