578 DR. R, VON LENDENFELD ON THE SYSTEMATIC [DeC. 21 



I. Subordo Lyssacina, Zittel. 



The spicules remain isolated or are subsequently cemented 

 together irregularly. 



i. Tribus Se xasterophora, F. E. Schulze. 



Hexaster always found in the mesogloea ; chambers distinct, 

 thimble-shaped. 



1. Familia Euplectellid^, F. E. Schulze. 



Thin-walled tubes or sacs with sword-shaped hexact hypodermalia, 

 the centripetal rays of which are the longest. 



1. Subfamilia Euplectellinee, F. E. Schulze. 



Tubular, with terminal sieve-plates. The wall regularly perfo- 

 rated. To the centrifugal ray of each hypodermal a floricome is 

 attached. 



Euplectella, Owen, and Regadrella, O. Schmidt. 



2. Subfamilia HolascincB, F. E. Schulze. 



Tubular, wall without perforations, without superficial flori- 

 comes. 



Holascus and Malacosaccus of F. E. Schulze. 



3. Subfamilia Taegerince, F. E. Schulze. 



Tubular or sac-shaped, wall irregularly perforated. Principalia 

 partially cemented, forming an irregular network. To the distal ray 

 of each hypodermal sword-shaped hexact a floricome is attached. 



Taegeria and Walteria of F. E. Schulze. 



2. Familia Asconematid^, F. E. Schulze. 



Pentact or hexact pinnulse in the dermal and gastral surfaces. 

 Hypodermalia and hypogastralia pentact. Discohexaster in the 

 interior. 



I. Subfamilia Asconetnalince, F. E. Schulze. 

 Sessile, sac-shaped, or tubular, with thin soft wall. 

 Asconema, Sav. Kent, and Aulascus, F. E, Schulze. 



2. Subfamilia SympagellincB, O. Schmidt. 



Pedunculate, cup-shaped. Principalia hexact and diact. Disco- 

 hexaster in the interior. 



Sympagella, O. Schmidt, Polyrhabdus, F. E. Schulze, and Bala- 

 nites, F. E. Schulze. 



3. Subfamilia CaulophacincB, F. E. Schulze. 

 Mushroom-shaped, with long cylindrical hollow peduncle. 

 Caulophacus and Trachycaulus of F. E. Schulze. 



