582 DR. R. VON LENDENFELD ON THE SYSTEMATIC [Dec. 21, 
4. Familia Corticip, Vosmaer. 
With candelabras. 
Oorticium, Schmidt, and Thrombus, Sollas. 
5. Familia PACHASTRELLID#, Sollas. 
With simple tetracts, irregularly scattered. 
Pachastrella, Schmidt, Battersbya, Bowerbank, and Dercitus, 
Gray. 
li. Subtribus Wacrocamere, nov. 
With large chambers. 
6. Familia PLaKxinip#, F. E. Schulze. 
With scattered diact, triact, and tetract spicules. 
Plakina, Plakinastrella, and Plakortis, F. E. Schulze, and Eupalaz, 
Sollas. 
7, Familia OscARELLIDH, Lendenfeld. 
Without spicules. 
Oscarella, Vosmaer. 
ii. Tribus T'rz anina, Sollas. 
The centres of the tetraxon spicules with one differentiated ray 
lie in the surface, in which the equal rays extend tangentially. 
8. Familia Grop1p4, 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 STELLETTIDs#, 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 amphiastrellee. 
Stryphnus, Sollas. 
3. Subfamilia Sanidasterina, Sollas. 
With stellate and sanidaster (?) spicules. 
Tribrachium, Weltner, and Tethyopsis, Stewart. 
4, Subfamilia Stellettina, Sollas. 
With two kinds of stellate flesh-spicules. 
Antrastra, Dragmastra, Sollas ; Stellettc, Schmidt. 
5. Subfamilia Homasterina, Sollas. 
With one kind of stellate flesh-spicules. 
Myriastra, Solias ; Asterella, Sollas; Pilochrata, Sollas. 
