Haddon and Shackleton — Actinice : I. -Zoantliece. 675 



Family. ZOANTHID^, Dana, 1846. 



(With the definition of the group. ) 



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



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

 mesenteries (cnemes) is imperfect : — 



GENEEA OF THE BRACHYCNEMINiE. 



ZoANTHUSj Lamarck, 1801. 



IsAUEUS, Grray, 1828. 



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



Torres Straits).) 



GrEMMAEiA, Duchassaing et Michelotti, 1860. 



Palythoa, Lamouroux, 1816. 



Sphenopus, Steenstrup, 1856. 



Sub-family. Maceocnemin^, Hadd. & ShackL, 1891. 



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

 mesenteries (cnemes) is perfect : — 



GENEEA OF THE MACROCNEMINJ]. 



Epizoanthus, Grray, 1867. (Not represented in Torres 



Straits). 

 Paeazoanthus, Haddon & Shackleton, 1891. 



Sub-fainily. Be ach yc N em i n^. 



ZOANTHUS, Lamarck, 1801. 



ZoANTHUS, Cuvier, 1817. 



ZoANTHUS (Rhyzanthus), Andres, 188L 



Brachycnemic Zoanthese with a double mesoglceal sphincter muscle. The 

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

 ectodermal canal system in the mesogloea. Dicecious or moncecious. Polyps 

 connected by a thin coenenchyme. 



5 E2 



