216 TEANSA0TI0NS LIVEEPOOL BIOLOGICAL SOCIETY. 



Kegarding the systematic position of Physcaphora, we 

 have apparently to place it in the family Placospongidce, 

 Sollas (8), provided we are right in our supposition that 

 the specimen in question is only the ectosome of a sponge, 

 and that the choanosome, when discovered, will not show 

 spicules of a different type. The Placospongidce are 

 sterrastrose Tetractinellida, possessing, however, no te- 

 tract, but only monaxonid megascleres. Of the two 

 genera of this family, Physcaphora is more closely allied 

 to Placospongia, Gray, both possessing tylostyli, whilst 

 Antares, Sollas, possesses diactine spicules. 



Thus we may perhaps propose the following diagnosis 

 of Physcaphora : Placospongidce in which the megasclere 

 is tylostyle and in which the cortex is formed chiefly of 

 selenasters. 



I now give a list of all the Sponges contained in the 

 collection. The classification is the same as used in my 

 " Eevision of Bowerbank's Nomenclature " (3). 



CALCAEEA. 



Order Homocoela. 

 Leucosolenia coriacea, Fleming. 



Order Heteeocosla. 

 Family Grantidce : Leucandra aspera, 0. Schmidt. 



Leucandra bulbosa, n.sp. 

 Family Heteropidce : Amphiute paulini, n.g. & sp. 

 Family Amphoriscidce : Heteropegma nodns-gordii, 

 Polejaeff. 



SILICEA. 



Order Monaxonida. 

 Family Haploscleridce : Halichondria, sp. ? 



Beniera (ci?ierea. Grant?) 



