792 PROF. A. DENDY AND MR. R. W. H. ROW ON 



(e. g. Carter, PoUjaeff, Urban, etc.), but as shewn by "Vosmaer 

 [1887] and Dendy [189.3 A], the name is not valid, as it had been 

 previously applied to a genus of Mollusca. 



Leucopsis von Lendevfeld [1885 B]. 



Type species L. pedunculata von Lendenfeld, { = Leiicosolenia 



pedunculata). 



This species was supposed by von Lendenfeld to be a transition 



form between Haeckel's Ascones and Leucones, but it seems to 



us that the structure described is far more probably that of a 



Clathrinoid Zeucosolenia provided with a stalk. 



Leucortis Haeckel [1872]. 



Type species L. pidvinar Haeckel, { = Leucandra pulvinar). 



Leuculmis Haeckel [1872]. 



Type species L. echinus Haeckel, {^Leucilla echinus). 



LiPOSTOMELLA Hacckel [1870]. 



Type species Z. clausa Haeckel, (=Leucetta primigenia). 



Medon Duchasscmig et Michelotti [1864]. 



Type species M. barbata Duchassaing et Michelotti {incertce 

 sedis). 

 A genus comprising two species, both of which are quite un- 

 recognisable, and may even not be calcareous sponges. 



Merlia Kirkpatrich [1908], 



Type species M. normani Kirkpatrick. 

 This sponge was originally desci-ibed as a member of the family 

 Pharetronidfe, but recently Kirkpatrick has shown that its true 

 place is among the Non-calcarea. 



Mlea Michlucho-Maday MS. ,j^cZe Haeckel [1872]. 



Type species M. cZo/wnn Michlucho-Maclay MS.,y?fZe Haeckel 

 [1872], {=Leucandra pulvinar). 

 The only authority for this name seems to be Haeckel, who 

 published several MS. names in the synonymy lists attached to 

 variovis species in his Monograph. 



MoBiusiSPONGiA Duncan [1880]. 



Type species M. jyarasitica Duncan. 

 An organism originally described as a parasitic calcareous 

 sponge, but it seems very doubtful whether it belongs to the 

 sponges at all. We certainly do not feel inclined to recognise it, 

 without further evidence, as a member of the Calcarea. 



Nardoa 0. Schmidt [1862]. 



T3^pe species iV. reticidum 0. Schmidt, (= Leucosolenia 

 reticidimi). 

 Minchin [1896] has shown that this name was previously 



