582 DR. R. VON LKNDENFELD ON THE SYSTEMATIC [DeC. 21, 



4. Familia Corticidjs, Vosmaer. 

 "With candelabras. 



Corticium, Schmidt, and Thrombus, Sollas. 



5. Familia Pachastrellid^, Sollas. 

 "With simple tetracts, irregularly scattered. 



Pachastrella, Schmidt, Battersbya, Bowerbank, and Dercitus, 

 Gray. 



ii. Subtribus Macroc amer ce, nov. 

 With large chambers. 



6. Familia Plakinid^, F. E. Schulze. 

 With scattered diact, triact, and tetract spicules. 



Plakina, Plakinastrella, and Plakortis, F. E. Schulze, and Eupalax, 

 Sollas. 



7 . Familia Oscarellid^, Lendenfeld. 

 Without spicules. 



Oscarella, Vosmaer, 



ii. Tribus Trianina, Sollas. 

 The centres of the tetraxon spicules with one differentiated ray 

 lie in the surface, in which the equal rays extend tangentially. 



8. Familia Geodid^e, Sollas. 

 A cortex of globate spicules. Chambers small, with small outlets. 

 Erylus, Gray ; Caminus, Schmidt ; Cydonium, Miiller ; Synops, 

 Vosmaer ; Isops, Sollas ; Geodia, Lamarck ; and Geodissa, Lenden- 

 feld. 



9. Familia Stellettid^e, Sollas. 

 With stellate flesh-spicules usually in the cortex. 



1. Subfamilia Psammasterina, Sollas. 

 With stellates and spined rods. 

 Psammastra, Sollas. 



2. Subfamilia Stryphnina, Sollas. 

 With stellates and amphiastrellae. 

 Stryphnus, Sollas. 



3. Subfamiha Sanidasterina, Sollaa. 

 With stellate and sanidaster (?) spicules. 

 Tribrachium, Weltner, and Tethyopsis, Stewart. 



4. Subfamilia Stelletlina, Sollas. 

 With two kinds of stellate flesh-spicules. 

 Antrastra, Dragmastra, Sollas ; StellettG, Schmidt. 



5. Subfamilia Homasterina, Sollas. 

 With one kind of stellate flesh-spicules. 



Myriastra, Sollas ; Asterella, Sollas ; Pilochrata, Sollas. 



