BY R. VON LENDENFELD, PH.D. 543 



VII. SUB-GENUS. SILICIFIBRIS. 

 The skeleton of the species belonging to this sub-genus is similar 

 in shape to that of the Regularis species. The main fibres are 

 perforated where they are, as it is generally the case, slightly 

 flattened. 



The connecting fibi'es are of uniform thickness and form a pretty 

 regular network. 



The peculiarity of the sponges belonging to this sub-genus is, 

 that they have a very great proclivity for foreign siliceous spicules, 

 which are not only found in great abundance in the main fibres but 

 also in the connecting fibres. 



It will be remembered that in none of the other sub-genera, 

 foreign bodies are found in the connecting fibres. 



SO. SPECIES. EUSPONGIA GALEA. 



Nova Species. 



Shape and Size. 



This species presents the shape of a graceful cup. It is 

 250 mm. high and measures at the top 260 mm. in diameter. 

 The margin of the cup is regularly circular. The cup is nearly 

 cylindrical the base being nearly as broad as the top. It is 

 perforated at the bottom. Also the sides ai-e perforated here 

 and there. The wall of the cup measures 100 mm. in thickness at 

 the thickest part and becomes thinner towards the margin, which 

 is sharp. 



Surface. 



The outer surface is rendered very uneven and irregular by the 

 appearance of numerous longitudinal iri-egular and round ribs 

 which extend over it. Only a skeleton is at my disposal. The 

 inner side of the cup is not near so uneven as the outer. The 

 skeleton indicates that there were askeletous portions, by the 

 presence of smooth grooves. 



