PORIFERA OP* THE L.M.B.C. DISTRICT. 227 



than in most species of Strypluius, and the oxeas are 

 not colossals, while they do seem to be arranged in bmidles." 

 Prof. Sollas further suggested placing Seiriola compacta as 

 a new species of the genus Stryphnas, Sollas.* 



In consequence of Prof. Sollas' s advice I have now de- 

 cided to drop the new family '' Seiriolidse" which I esta- 

 blished in my former report, and I place the new sponge 

 amongst the Sanidasterina, a sub-family of the family 

 Stellettidse. But I still intend to retain the new genus 

 " Seiriola." The differences between it and the genus 

 Stryphnus justify, I think, my doing so. These differences 

 are : — 



(1.) Stryphius — The choanosomal megascleres are colos- 

 sal oxeas, closely strew^n through the sponge, 

 not aggregated to form fibres and not radiately 

 arranged. Seiriola — The choanosomal megas- 

 cleres are oxeas of ordinary size, and besides those 

 also styli, strongyla and tylota. The spicules 

 seem to be aggregated in bundles, and somewhat 

 radiately arranged. 

 (2.) StrypJuiHs — The microscleres are some form of eu- 

 aster, and an irregular amphiaster or sanidaster. 

 Seiriola — The microscleres are typical forms of 

 oxyaster and sanidaster. 

 (3.) Stryphiius — The flagellated chambers are either ap- 

 hodal or slightly diplodal. Seiriola — The flagel- 

 lated chambers are eurypylous. 

 Stelletta collingsi, Bowerbank (PI. XIV., figs. 1—3). 



Tethea collingsi i, Bowerbank. 

 Tetliea schmidtei, Bowerbank. 

 Collingsia sarniensis, Gray. 

 Collingsia schmidtei, Gray. 

 Stelletta coUingsii, Sollas. 



The sponge, which in my former report was mentioned 



* Sollas, loc. eit., p. 171. 



