790 PROF. A. BENDY AND ME. R. W. H. ROW ON 



Dyssycarium Haeckel [1872]. 



Type species D. egedii O. Schmidt, (=Leucandra egedii). 

 In proposing this genus Haeckel states that it is equivalent to 

 O. tSchmidt's Sycinula. Both these are considered by iis to be 

 synonyms of Leucandra, but the question is discussed in more 

 detail under Sycimda. 



Dyssyconella Haeckel [1870]. 



Type sj)ecies D. immila Bowerbank, {= Leucandra pumila). 



Dyssycum Haeckel [1870]. 



Type species D. Jistulosum Johnston, { = Leitcandra Jistidosa). 



Dyssycus Haeckel [1872]. 



Type species D. primigenius Haeckel, {^ Leucetta prwiigenia'). 

 A genus of the artificial system, identical with Dyssycum of 

 the ' Prodromus ' of 1870. There does not seem to be any reason 

 for the cliange of spelling, but sach changes, and sometimes more 

 radical ones, Avere made by Haeckel in several cases in his later 

 work. 



Ebnerblla von Lendevfeld [1891]. 



Type species E. huccichii von Ebner, (= Amjyhoi'iscus 

 huccichii). 



GuANCHA MichlucJio-2Iaclay [1868]. 



Type species G, hlanca Michlucho-Maclay, {:= Leucosolenia 

 hlanca). 



Heteropegma Polejaeff [1883]. 



Type species H. nodus-gordii Polejaeff, { = Leucaltis clathria). 

 As we have shown when discussing Leucaltis, Polejaeflf's name 

 is merely a synonym of the latter, 



Homandra von Lendenfeld [1891]. 



Type species H. falcata von Lendenfeld, (= Leucosolenia 

 falcata). 

 This genus is the equivalent of Ascandra in Minchin's sense 

 [1896, 1900, &c.], but must not be confused with Ascandra in 

 the original sense of Haeckel. The latter genus was used by 

 von Lendenfeld in almost exactly Haeckel's sense, so that, since 

 he considered A. falcata to be worthy of generic separation, a 

 new name became necessary. At a later date Minchin revised 

 the classification of the homoccel sponges, and relegated the 

 name Ascandra to A. falcata, so that the name Homandra 

 was rendered unnecessary. (See, for details, Minchin [1896, 

 1897].) We have given above (p. 720) our reasons for considering 

 the separation of L. falcata from the genus Leucosolenia to be 

 inadvisable. 



