220 Dr. W. Weltner: Beiiclit über die Leistungen 



Farn. I: Tetillidae Sollas. 



Sigmatophora in which the characteristic megascleres are 

 slender protriaenes. 

 Gen. Tetilla 0. Schm , Chrotella Sollas, Cinacliyra Sollas, Craniella 

 0. Schm. 

 Farn. II : Samidae Sollas. Sigmatophora in which the characteristic 

 megasclere is an amphitriaene. 

 Gen. Samus Gray. 

 Suborder II: Astrophora Sollas. 



Choristida in which one or more of the microscleres is an 

 aster. 

 Demus I: Streptastrosa Sollas (für Spirastrosa Soll, 1887). 



Astrophora in which one of the microscleres is a spiraster, 

 or when this is not the case one of the megascleres is a 

 calthrops. 

 Farn. Theneidae Sollas. Streptastrosa in which the microscleres 

 are spirasters or amphiasters, and oxyasters or microxeas. 

 Gen. Theuea Gray, Characella Sollas, Poecillastra Sollas, 

 Sphinctrella 0. Schm., Triptolemus Sollas, Staeba Sollas, 

 Nethea Sollas, Placinastrella F. E. Schulze. 

 Fam. Pachastrellidae (Carter). Streptastrosa in which the chief 

 megascleres are calthrops, triaenes being absent. The 

 microscleres may be spirasters, spherasters, or microrabds. 

 Gen. Pachastrella 0. Schm., Dercitus Gray, Calthropella Sollas. 

 DemusII: Euastrosa Sollas. 



Astrophora in which euasters are always preseut, but never 

 spirasters nor sterrasters. Triaenes are present but not 

 calthrops. 

 Farn. Stellettidae Sollas. Euastrosa in which the megascleres are 

 oxeas and triaenes. The chamber-system is aphodal and 

 the mesoderm of the choanosome sarcenchymatous. The 

 ectosome may or may not form a cortex. 

 Subfam. Homasterina. 



Stellettidae which never possess more than one form 

 of aster. 

 Gen. Myriastra Sollas, Pilochrota Sollas, Astrella Sollas. 

 Subfam. Euasteriua. 



Heterastrose Stellettidae in which the additional micro- 

 sclere is a euaster. 

 Gen. Anthastra Sollas, Stelletta (0. Schm.), Dragmastra 

 Sollas, Aurora Sollas. 

 Subfam. Khabdasterina. 



Heterastrose Stellettidae in which the additional micro- 

 sclere is a microrabd. 

 Gen. Ecionema(Bwk.), Psamraastra Sollas, Papyrula(0. Schm.), 

 Algol Sollas. 



