1124 A MONOGEAPH OF THE AUSTRALIAN SPONXtES, 



their basal ray being directed towards the closed end of the animal. 



Stout acerate spicules, sparsely scattered in the wall perpen- 

 dicularly to the outer surface, often projecting from it ; spindle- 

 shaped, tapering from the centre to a sharp point at each side, 

 either straight or slightly curved; rarely exceeding 0-75 mm. in 

 length and 0-07 mm. in diameter. 



Slender acerate spicules of the same shape and disposed 

 similarly to the last mentioned form, rarely longer than 3 mm. 

 with a diameter of 0025 mm. 



Acerate spicules of the collar straight or curved, either sharply 

 or bluntly pointed, 0-5 — 1 x 0018 mm. 



Locality: East Coast of Australia. Station 163a, June 3, 

 1874, off Port Jackson ; depth 30 to 35 fathoms; rock. 



39. SPECIES. LEUCORTIS PULVINAR. E. Haeckel (1.) 



SYCOLEPSIS PULVINAR. E. Haeckel (2.) 



MLEA DOHRNI. N. Miklouho (3.) 



LEUCORTIS PULVINAR VAR. INDICA. E. Haeckel (4). 



This species forms, in the adult stage, solitary persons or 

 colonies, with or without mouth- opening. The latter is always 

 simple and naked. The canal- system is always very narrow and 

 especially the Gastral cavity of a very small extension. 



In the lipostome forms the latter coalesces entirely, so that the 

 whole Sponge gets the appearance, in a transverse section, for 

 the naked eye of quite massive heap, without any visible cavity. 

 The Parenchyma fii-m. The solitary form mostly appears as a 

 conic, oval or roundish, rather irregular mass, which has no 

 peduncle. Its diameter is mostly 5 to 10, rarely 15 to 20 mm. 

 A longitudinal section shows that the Grastral cavity is very 

 narrow, rarely exceeding I or 1*5 mm. in diameter. The colonial 

 specimen forms very irregular roundish colonies of a bulbous or 



(1.) E. Haeckel. Die Kalkschwamme. Eine Moiiographie. Band II., 

 Scite 162., Band III., pi. XXIX. 



(2.) E. Haeckel. Prodromuseines Systems der Kalkschwamme. Jenaische 

 Zeitschrift fiir Medicin und Naturwissenschaft, 1870 ; Band V., Heft II., 

 Seite 251. 



(3.) N. Miklouho- Malcay. Manuscript. 



(4.) E. Haeckel. L.c. Band II., Seite 163. 



