304 REVISION OF THE iMONAXONID SPONGES, i., 



interesting to note that man}^ of the shells, even in the upper 

 part of the sponge, are penetrated by tubular excavations similar 

 in nature to those produced by other species of Clioria. 



Spicules. — The tylostyli are straight or nearly so, gradually 

 sharp-pointed, and of nearly uniform diameter throughout three- 

 fourths or more of their length; they are provided with a rather 

 large phyma of variable but usually symmetrical shape, which is 

 often surmounted by a smaller dome; and they measure from 

 about 300 to 490 /x. in length by 13/x in maximum diameter. 

 Occasional styli of the same dimensions are met with. The 

 microscleres are of three kinds : (i.) spirasters, of variable form; 

 usually with a nearly straight axis; provided with spines of 

 medium length, rarely exceeding the diameter of the spicule, and 

 more or less spirally disposed; rarely less than 25 or more than 

 45 [x in length; and measuring up to 6 /x in stoutness, exclusive 

 of spines, (ii.) Cylindrical, slightly undulating or spiral, trun- 

 cately-ended, very minutely and closely spined rods; seldom less 

 than 10 /x or more then 30 /x in length; and rarely exceeding 3 /x 

 in diameter, exclusive of spines, (iii.) Spined microxea; similar 

 to those of (Jliona hixoni; bb to 110/x in length. 



Log. — Port Jackson. 



Remarks. — For reasons indicated in my remarks on Cliona 

 hixoni, I propose that Papillissa be provisionally retained as a 

 subgenus of Cliona. 



Familia SUBERITID^. 

 In addition to Flectodendrori elegans, dealt with below, 

 there is described in the Catalogue, under this family, a 

 species, recorded from Port Jackson and the South Coast of 

 Australia, to which Lendenfeld attached the. name Suberites 

 domuncula Nardo. The identity of this sponge, I have been 

 unable to determine. A specimen labelled, in Lendenfeld 's 

 handwriting, ''Suberites domuncula, Port Jackson," is pre- 

 served in the Australian Museum, and a fragment of a speci- 

 men, bearing the same name and locality, has been received 

 from the British Museum ; but these agree neither with the 

 description given nor with one another, — although- both, how- 



