250 Proceedings of the Royal Society of Victoria. 



B.M. sp. 17 ("Polymastia bicolor Type," Reg. 86-12-15-97); 

 sp. 19 ("Polymastia bicolor, C. var. glomerata," Reg. 86-12-15-114). 



Polymastia ? massalis, - Carter. 



Polymastia massalis, Carter, A.M.N.H., February, 1886, p. 121. 



This species appears to resemble P. bicolor in external form 

 and to differ from it chiefly in the smaller size of the principal 

 spicules. It is probably a mere variety. 



B.M. sp. 20 ("Polymastia massalis, G," Reg. 86-12-15-53). 



Polymastia crassa, Carter. 



Polymastia bicolor, var. crassa, Carter, A.M.N.H., February. 

 1886, p. 120. 



There are numerous specimens in the collection of a typical 

 Polymastia, with well-developed mastoid processes containing the 

 usual longitudinal bundles of very large and stout spicules, 

 besides the smaller spicules. These specimens appear to agree 

 sufficiently closely with Carter's Polymastia bicolor, var. crassa to 

 justify an identification. The species must, however, be separated 

 from P. bicolor, though whether it is distinct from previously 

 described species of Polymastia may be considered doubtful. 



R.N. 273 (20 f. : "sand-brown, projections dull yellow"); -4-10 

 (s. 9, 21 f.; "pinkish-buff"); 1098 (xC); 1135 (x); 1146 (x); 

 1169. 



B.M. sp. 18 ("Polymastia bicolor, C. var. crassa," Reg. 86-12- 

 15-39); d. 114 ("Polymastia bicolor, var. crassa," Reg. 87-7-11-29); 

 ?d. 32 ("Polymastia bicolor,- Reg. S6-1 2-1 5-354). 



Genus Cliona, Grant. 



Suberitidse of boring habit, excavating narrow passages in 

 shells, etc. 



It appears certain that the sponge sometimes outgrows the 

 shell which it attacks and then assumes a massive form (e.g. 

 Raphyrus griffithsii ). 



Cliona celata, Grant. 



Cliona celata, Grant, Edinburgh New Philosophical Journal, 

 I., 78 : II., 183, pi. 2, tig. 7. 



Halichondria ? celata, Johnston, British Sponges, p. 125. 



