6V E. F. KALLMANN. 307 



barely more than sufficient in quantity to bind the spicules 

 together ; but in another (undescribed) species, it is developed 

 fairly abundantly and forms a well-defined sheath to all but 

 the slenderest fibres. The spicules are of a single kind, and of 

 characteristic form; they are tylostyli with a much depressed 

 phyma, which makes them appear nail-shaped. Of the dermal 

 skeleton of C . rrrfiri/h/fa I cannot speak, since both specimens 

 ac my disposal have the surface completely abraded ; but in ('. 

 eler/a/is, and in the undescribed species, (which comes from 

 the south coast of Australia, and in habit somewhat resembles 

 C. elegans), there is a well-defined dermal membrane contain- 

 ing tangential, reticulately-arranged spicules and provided 

 also with slightly projecting spicules directed vertically. The 

 dermal membrane of C. elegans is thin and translucent : that 

 of the undescribed species is much more densely charged with 

 spicules, and, in the dry sponge, appears as a well-marked, 

 easily separable, whitish pellicle. 



This combination of characters, to which might be added 

 the non-massive external form of the sponge(Pl.xviii., fig.l), 

 definitely distinguishes CaulosjjoDfila from any other genus of 

 the Suherifida'. Indeed, owing to the considerable degree of 

 development of spongin, it is somewhat doubtful whether the 

 genus really is related to the Suberi/idce, although in Laxo- 

 suherifes, spongin, in small amount, is said to occur. 



Lendenf eld's description of C. elegans is, in the main, cor- 

 rect, and is sufficient to enable the species to be identified : in 

 the type-specimens, the spicules measure from (rarely) less 

 than 140 /x to 220 /x in length, and attain 11 /x in diameter 



Loc. — Port Jackson. 



Familia CHONDROSID^. 



Chondrosia collectrix. 



Introdactorg.' — The type-specimen, allowance being made 



for its being only a portion of the original, is consistent in 



every way with the description except as regards colour, and 



perhaps also certain features of the canal-system — more espe- 



