CALCAEEOUS SPONGES. 791 



HoMODERMA von Lenclenfeld [1885 A]. 



Type species H. sycandra von Lenclenfeld, (=Si/con sycandra). 

 This genus was proposed for a somewhat alDerrant Sycon, and 

 was made by its author the only genus of a new family of Ascones, 

 the Homodermidse. The question has been dealt with to some 

 extent above (p. 716), and is fully investigated in Row's report 

 on the Calcarea of the Hamburg South- Western Australian 

 Expedition of 1905 (see Row [1913 MS.]). 



HoMETTA von Lendenfeld [1891]. 



A genus proposed by von Lendenfeld on hypothetical characters, 

 and without any species. 



Hypodictyon Jenkin [1908 B]. 



Type species H. longstaffi. Jenkin, (^:=Sycon longstaffi). 

 This genus was erected by Jenkin for the above species, and 

 placed by him in his supposed family Chiphoridaj, on account of 

 the presence of chiactines, being separated from Strejytocontis on 

 account of the " linking " of the chambers. If either of these 

 characters is considered by us as of generic value. 



Hypograntia Carter [1885-1886]. 



Type species H.infrequens Carter, { = Grantio-psis infrequens). 

 This genus was proposed by Carter for several species of diverse 

 nature, and the diagnosis was extremely unsatisfactory. Further, 

 the first {i.e. type) species was said by its author to be "incertse 

 sedis." Under these circumstances we do not feel that we can 

 allocate the name to any of our genera. 



Leuckartea Michlucho-Maclay W^.,fide Haeckel [1872]. 



Type species L. natcdensis Michlucho-Maclay MS., fide 

 Haeckel [1872], (=:S'ycon ramosum). 

 The only warranty for this name seems to be that it is included 

 in the synonymy list attached to Haeckel's Sycandra ramosa ns a 

 MS. name of Michlucho-Maclay's. 



Leucogypsia Boioerhanh [1864-1882]. 



Type species L. gossei Bowerbank, { = Leucandra gossei). 

 One of the four genera of Calcareous sponges proposed by 

 Bowerbank in his ' Monograph of British Sponges.' It is now 

 usually considered to be a synonym of Leucaiulra, and although 

 perhaps it has right of priority over the latter, yet we feel that 

 the name Leucanclra is so well known that it should be preserved. 



Leucometra Haeckel [1872]. 



Type species L. primigenia IL-Aeckel, (=Leiccetta 2}rimigenia). 



Leuconia Grant [1841]. 



A genus proposed by Grant and used by many subsequent 

 authors very nearly in the sense in which we use Leucandra 



