PLATE XI 



1. Cerebratulus lacteus Leidy 



2. Micrura leidyi Verrill 



3. Leptoplana variabilis Grirard 



4. Cryptosula pallasiana Moll 



5. Bdelloura Candida Girard 



6. Malacobdella grossa Muller 



7. Alcyonidium polyoum Hassall 



8. Alcyonidium verrilli Osburn 



9. Smittina trispinosa nitida Verrill 



10. Hemiseptella denticulata Smitt 



11. Hippodiplosia americana Verrill 



12. Membranipora tuberculata Bosc 



13. Electra monostachys Busk 



14. Bugula turrita Desor 



15. Bugula gracilis uncinata Hincks 



16. Crisia eburnea Linne 



17. Bugula flabellata Thompson 



18. Bowerbankia gracilis Leidy 



