Synopi:ils of the Au'^irallan Calcarea Heterocwla. 105 



exhalant canals. The texture is very coaise, bard and dense; 

 the surface is irregular, and often characteristically ridged ; 

 frequently the huge triradiate spicules can be seen with the 

 naked eye on the dermal suiface. Some specimens have a 

 few quadriradiate spicules, while in others I cannot find any. 



Some of the s])ecimens measure four or five inches in their 

 longest diameter, and one was remarkable from having been 

 of a green colour in life, probably due to symbiotic algre. 



The flagellated chambers are approximately spherical ; 

 thickly scattered through the sponge, and about ()'12 mm. 

 in diameter. In some specimens the mesoderm around the 

 chambers is very strongly developed, giving to the sponge a 

 very dense texture. The inhalant pores are scattered thickly 

 over the dermal surface, at any rate in parts. 



The skeleton is dense and very irregular, consisting of 

 scattered triradiates of two very different sizes, i-ather small 

 and enormously large, the former being most abundant. 



I ccuisidor Pol^jaefi's Leuconia dura to be identical with 

 this species, because I do not think the presence of sagittal 

 spicules in the neighbourhood of the osculum is a specific 

 character, as it is of such extremely general occurrence. 



Localities. — Near Port Phillip Heads (Stations 1 and .9 

 and outside the Heads, coll. J. B. Wilson) ; Torres Straits 

 (Ridley, Pol^jaefi) ; Port Jackson (von Lendenfeld). 



52. Leucandra Jimtkeliaiia, Polejaefi", sp. 



Leucetta hceckeliana, Polejaeff. Rejiort on the Calcarea 

 of the Challenger Expedition, p. 69. 



Voamaeria hceckeliana, von Lendenfeld. Proceedings of 

 the Linnean Society of New South Wales, Vol. IX, p ] 1 14. 



Loc(ditj/.—Oii' Port Jackson (Polejaefi). 



53. Lelapia aastralis, Carter. 



(?) Lelapia austral is, Gray. Proceedings of the Zoological 

 Society of London, 18G7, p. 557. 



Lelapia austrcdis, Carter. Annals and Magazine of 

 Natural History, August 1 88G, pp. 1 38 and 1 48. 



This sponge appears tt) be of exce|)tional interest, and I 

 greatly regret that I have never had an opportunity of 

 examining it. 



Localitij.—]<leAv Port Philli)) Heads (Carter). 



