§ 24, THE POLYPI. 37 
Famity: SErruLaRIna. 
Genera: Sertularia, Campanularia. 
Famity: ZoanTaina. 
Genus: Zoanthus. 
Famity: Hypgina. 
Genera: Hydra, Eleutheria, Synhydra, Coryne, Syncoryne, Corymorpha. 
Famity: Actrnina. 
Genera: Actinia, Eumenides, Edwardsia. 
ORDER II. BRYOZOA. 
The digestive canal is closed from the general cavity of the body, and 
opens behind through an anus. 
Famity: REereporina. 
Genera: Eschara, Cellepora, Flustra, Bicellaria, Retepora, Telegraphina, 
Tendra. 
Famity: ALCYONELLINA. 
Genera: Cristatella, Alcyonella, Bowerbankia, Vesicularia, Lagenella, 
Plumatella, Lop Bg 
BIBLIOGRAPHY. 
Ellis. Essai sur )’Histoire naturelle des Corallines et d’autres produc- 
tions marines du méme genre. La Haye, 1756. 
Pallas. Hlenchus zoophytorum. Hagae 1766. 
Cavolini. Memorie per servire alla 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. 18382. 
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 following 
whose organization has been specially studied. classes. 
