6 Porifera. 



Weber collected Fresh-water sponges in Sumatra, Java, Celebes and Flores. 

 He enumerates six species belonging to the genera Spongilla, Ephydatia and Tu- 

 bella. Three of these are new. See also Mackay, Sovinsky, and Zykow. 



See supra, p 2, Hanitsch, p 3, Topsent ( 3 ), p 3, Delage, p 4, Mac Munn. 



B. Ceratina. 



See Lendenfeld (*). 



Fol wishes to reestablish the genus Hircinia and establishes a new allied genus, 

 Sarcomus (S. georgin.}. According to the author the so-called fibrillae are by 

 no means parasites or commensalists , but originate from fusiform cells belonging 

 to the connective tissue of the sponge. 



Dendy ( 4 ) writes against Lendenfeld's article of 1889 [cf. Bericht f. 1889 Pori- 

 fera p 8]; he maintains his old views about the flagellated chambers of Stelo- 

 spongus ; and so he does as for the generic name, which Lendenfeld had changed 

 into Thorecta. In the same paper he upholds against Poldjaeff [cf. Bericht 

 f. 1889 Porifera p 7] the view that the Ceratina are descendants from siliceous 

 sponges. See also Lendenfeld ( 4 ), and Anonymus. 



C. Porifera calcaria. 



Dendy ( 2 ) draws attention to the fact that in Grantia labyrinthica the larvae 

 lie in a well-determined position, between flagellated chamber and skeleton of its 

 wall. The granular cells are on the side of the skeleton (spicules), the columnar 

 cells on the side of the flagellated chamber. The granular cells proliferate rapidly, 

 and as they cannot project outwards, on account of the rigid spicules of the 

 mother-sponge, they become invaginated and give rise to the well-known pseudo- 

 gastrula. The free larva consists of a wall of flagellated cells on one side and 

 cubic cells on the other. Within, there is a mass of cells serving chiefly as food- 

 yolk. Part of it may give rise to the mesoderm and calcoblasts. 



See Giard, Ridley, and supra, p 2, Hanitsch, p 4, Mac Munn. 



According to Dendy ('), the type species of Teichonella, [prolifera] , contrary to 

 ordinary descriptions, has the pores on both sides and the oscula at the top, 

 along the margin. The sponge is, in short, a typical Leucon. A bright me- 

 tallic green calcareous sponge is recorded. 



