CALCAREOUS SPONGES. 789 



Calcispoxgia de Blainville [1834-1837]. 



Type species C. compressa Fabric! us, {■=-Grantia compressa). 

 This genus was proposed by de Blainville in exactly the same 

 sense as Fleming's Grantia [1828]. Since the latter genus takes 

 priority, Calcispongia becomes merely a synonym of it. 



CliATHRINA G^xiy [1867]. 



Type species C. clathrus 0. Schmidt, (= Leucosolenia 



clathrus). 



This genus has been employed by Minchin [1896, 1900] as the 



type genus of one of his families of homocoel sponges. We have 



already (p. 718) given our reasons at length for not accepting his 



conclusions. 



Clystolynthus Haechel [1870]. 



Type species C. vesicula Haeckel, { = Leucosolenia vesicida). 



CoENOSTOMELLA Haeckel [1870]. 



Type species C. caminus Haeckel, {=Leucandra caviinus). 



Cgenostomium Haechel [1872]. 



Type species G. cramhessa Haeckel, {^-Leucandra crambessa). 



C(ENOSTOMUs Haeckel [1872]. 



Type species C . primigenius Haeckel, { = Leucetta primigenia), 



Cyathiscus Haeckel [1870]. 



Type species G. actinia Haeckel, { = Aphrocerccs alcicornis). 



Dermatreton JenJcin [1908 B]. 



Type species Z). chartaceum Jenkin, { = Grantia chartacea). 

 This genus was proposed by Jenkin for certain species of the 

 family Grantiidse, which possess " linked " chambers. "We do not 

 consider that this character is of generic rank, and we have there- 

 fore included both these species in the genus Grantia. 



Bjeddea Michlucho-Maclay MS. {Jide Haeckel [1872]). 



Type species D. violacea Michlucho-Maclay MS., /fZe Haeckel 

 [1872], { = Grantessa stauridea). 

 The generic name Djeddea is quoted by Haeckel in the 

 synonymy list attached to his Sycetta stauridea. This seemsHo 

 be the only authority for the name. 



Dunstervillia Boicerbanh [1845]. 



Type species D. elegans Bowerbank, {=:Sycon elegans). 

 Bowerbank's genus was adopted by Haeckel as one of the 

 genera of his " artificial " system, but no other author seems to 

 have made use of it save Gray. It is now considered to be merely 

 a synonym of Sycon. 



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