Haddon and Shackleton — Actinice : I. Zoanthece. 675 



Family. ZOANTHID^, Dana, 1846. 



(Witli the definition of tlie group.) 



Sub-family. Beachycnemin^, Hadd. & Shackl., 1891. 



Zoanthese in which the sulcar element of the primitive sulco-lateral pair of 

 mesenteries (cnemes) is imperfect : — 



GENERA OF THE BRACHYCNEMIN^. 



Zoanthus, Lamarck, 1801. 



Isaurus, Grray, 1828. 



( ? Mammillifera, Lesueur, 1817. (Not represented in 



Torres Straits). ) 



Gemmaria, Duchassaing et Michelotti, 1860. 



Palythoa, Lamouroux, 1816. 



Sphenopus, Steenstrup, 1856. 



Sub-family. Macrocnemin^, Hadd. & Shackl., 1891. 



Zoanthese in which the sulcar element of the primitive sulco-lateral pair of 

 mesenteries (cnemes) is perfect : — 



GENERA OP THE MACROCNEMIN^. 



Epizoanthus, Grray, 1867. (Not represented in Torres 



Straits). 

 Paeazoanthus, Haddon & Shackleton, 1891. 



Sub-family. Br ach ycn em i n^. 



ZOANTHUS, Lamarck, 1801. 



Zoanthus, Cuvier, 1817. 



Zoanthus (Rhyzanthus), Andres, 1884. 



Brachycnemic Zoanthese with a double mesogloeal sphincter muscle. The 

 body-wall is unincrusted ; the ectoderm is usually discontinuous ; a well developed 

 ectodermal canal system in the mesogloea. Dioecious or monoecious. Polyps 

 connected by a thin coenenchyme. 



5E2 



