56 TUBEEELLA. — SOLLA8ELLA. 



Genus TUBERELLA. 



Tethyclse with a smooth surface or with tubercular protuber- 

 ances. Without fibrinous cortex. Spicules : styli of varying size. 



Tuberella tethyoides, Keller. 



Tuherella teihyoides, C. Keller, " Neue Ccelenteraten aus dem Golfe von 

 Neapel," Arclnv fiir mikroskopische Anatomic, Baud xviii. Seite 271. 



GEOGKAPniCAii Distribution. — Mediterranean : Naples. 



Familia SOLLASELLID^. 



Monaxonia the cortex of which is composed of the expanding 

 surface-tufts of the radiating spicule-bundles. Chonse are situ- 

 ated between these. The skeleton of the interior consists of 

 irregular, not radially disposed, spicule-bundles. 



Genus SOLLASELLA, n. gen. 

 With stylote megasclera and without microsclera. 



SoUasella digitata, n. sp. 



Irregular digitate sponges, which are attached by a small base. The digitate 

 processes are regularly cylindrical, with a transverse circular section 12-15 

 inillim, in diameter. Very often two or more branches partly coalesce for some 

 distance, so that the processes become irregular. The whole sponge attains a 

 length of 130 millim. The individual, terminally rounded, branches are 30-50 

 millim. long. The surface appears hairy, some spicules protrudiug 2 millim. 

 beyond it; these, however, are not numerous. Polygonal fields 1-2 millim. in 

 diameter are found on the surface ; these are expressions of the terminations 

 of the surface-tufts of the spicule-bundles. These fields are divided from each 

 other by sharply defined iucisions, which are 0*6 millim. wide, and about as 

 deep. Colour black in the interior ; the cortex is of a lighter brown colour. 

 In the depressions between the surface-tufts, rows of inhalant pores of a 



