586 DR. R. VON LENDENFELD ON THE SYSTEMATIC [DcC. 21, 



8. Group Euchalinince, Lendenfeld. 



Slender, regularly digitate forms with a fine-meshed network and 

 slender spicules. 



Chalina, auctorum, and Bactylochalina, Euchalina, Euchalinopsis, 

 and Chalinodendron, Lendenfeld. 



3. Familia Heterorhaphid^, Ridley and Dendy. 

 Megasclera of various forms ; microsclera commonly present, but 

 never chelae. Marine sponges, without gemmulse. 



1. Subfamilia Phloeodictyince, Carter. 



Sponge divisible into body and fistulse, with a strong spicular 

 rind. Megasclera oxea or strongyla ; microsclera (when present) 

 sigmata. 



JRhizochalina, Schmidt ; Oceanapia, Norman. 



2. Subfamilia GeUiince, Ridley and Dendy. 



Megasclera oxea or strongyla. Microsclera always present, viz. 

 sigmata. No rind or fistulfe. 



Gellius, Gray ; Oelliodes, Ridley. 



3. Subfamilia TedaniineB, Ridley and Dendy. 

 Megasclera of two forms : raonactinal, styli, forming the main 



skeleton ; and diactinal, tylota. Microsclera long, hair-like trichites. 

 Tedania, Gray ; Trachytedania, Ridley. 



4. Subfamilia DesmacellincB, Ridley and Dendy. 



Megasclera styli to tylostyh. Microsclera sigmata or toxia, or 

 both. 



Desmacella, Schmidt. 



5. Subfamilia HamacanthincB, Ridley and Dendy. 



Megasclera oxea or styli ; microsclera diankistra, to which others 

 may be added. 



Hamacanthay Gray ; Vomerula, Schmidt. 



4. Familia Desmacidonid^e, Vosmaer, auct. 



Megasclera of various forms. Microsclera chelae, to which others 

 may be added. 



1. Subfamilia Esperellince, Ridley and Dendy. 



Fibre not echinated by laterally projecting spicules. 



Esperia, Nardo ; Esperella, Vosmaer ; Esperiopsis, Carter ; Cla- 

 dorhiza, Sars ; Acconiderma, Ridley and Dendy ; Chondroeladia, 

 Wyv. Thomson ; Desmacidon, Bowerbank ; Homoeodictya, Artemi- 

 5ina, Vosmaer; Phelloderma, Ridley and Dendy; Sideroderma, Ridley 

 and Dendy ; lophon. Gray ; Amphilectus, Vosmaer ; Melonanchora, 

 Carter ; Guitarra, Carter. 



