§ 24. THE POLYPI. 37 



Family : Sertularina. 

 Genera : Sertularia, Campanularia. 



Family : Zoanthina. 

 Genus J Zoanthus. 



Family : Hydeina. 

 Gsnera : Hydra, Eleutheria, Synhydra, Coryne, Syncoryne, Corymorpha. 



Family : Actinina. 

 Genera : ^ctinia, Eumenides, Edwardsia. 



ORDER 11. BRYOZOA. 



The digestive canal is closed from the general cavity of the body, and 

 opens behind through an anus. 



Family : Reteporina. 



Genera : Eschara, Cellepora, Flustra, Bicellaria, Retepora, Telegraphina, 



Tendra. 



Family: Alcyonellina, 



Genera : Cristatella, Alcyonella, Bowerbankia, Vesicidaria, Lagenellat 

 Plumatella, Lophopus.^^^ 



BIBLIOGRAPHY. 



Ellis. Essai sur I'Histoire naturelle des Corallines et d'autres produc- 

 tions marines du meme genre. La Haye, 1756. 



Pallas. Elenchus zoophytorum. Hagae 1766. 



Cavolini. Memorie per servire alia storia dei polipi marini. Napoli^ 

 1785. 



Rapp. Ueber die Polypen im Allgemeinen und die Aktinien insbeson- 

 dere. Weimar, 1829. 



Ehrenberg. Die Corallenthiere des rothen Meeres, in the Abhandl. d. 

 Berliner Akad. 1832. 



Johnston. A History of the British Zoophytes. Edinburgh, 1838. 



Besides the important work of Dana, which will be often quoted in my 

 notes, the additions to the literature of the true polyps have been few since 

 the issue of this work, and have generally been published in the form of 

 articles in the various periodicals, to which reference will be made in my 

 notes. But the Bryozoa have been specially studied, and particularly in 

 the following papers : 



1 There are here enumerated only those families This remark applies equally to the folloirfnr 

 whose organization has been specially studied, classes. 



4 



