EOSSELLIN^i 19 



a*. — Trichaster present besides ordiuaiy oxyliexaster with larbed terminals. 



Trichasterina F' E. ScH. (No. 26). 



i*. — "Without trichaster. Oxyhexaster terminals rough or nearly smooth 



Bathydorus F. E. ScH. (Nos. 28-oo). 



d^. — Hexaster consists of oxyhexaster and discoliexaster. 



c'. — Deriualia, pentactins with the unpaired ray distally directed 



Asconema S. Kent. (No. 25). 



d^. — Dermalia variable; generally without distally directed ray, which, if present, 

 as it sometimes is, invariably belongs to a hexaster Jand not to a pentactin. 

 c'-\ — Body smaller than acorn-size; parenchymalia include a considerable 



([uantity of relatively large hexactins VitroUida Is. (No. 0.) 



(Z^î.— Body much larger; parenchymalia, diaclins only or may include medium • 

 sized or small hexactins. 

 «*. — Gastralia not hexactins, but pentactins or other forms witlxout free 



proximal ray. Sponge M'itli distinct stalk 



Craieromorphu F. E. ScH. (Nos. 11-15), 



6*.— Gastralia, hexactins. Sponge generally without, but sometimes with 

 stalk. 



a*. — Pentactinic Jiypodermalia i)artly witli spiny and partly witli 

 smooth paratangentials. Rooted in loose bottom by basal pro- 

 cesses Schaudinnia F. E. ScH. (No. 10). 



i'-— All pentactinic hypodermalia with smooth paratangentials rough 

 at ends'only. Firmly attached at base. 

 o^. — Discohexaster in one small form of moderately uniform size 



Hyalasciis Ij. (Nos. 16-18). 



i". — Discohexaster in inore tlian one form and diflering in size ; 

 at any rate, the smallest being of about half tiie diameter 

 of the largest, or even much smaller. 



a'. — Discoliexaster distinguishable into three varieties, of 

 which the largest has the terminals to each principal 

 arranged in a narrow or a ) erianth-like tuft. Other 



varieties spherical Rossella Cart. (Nos. 1-4). 



h'. — Discohexastcrs all spherical, and without the largest 



form mentioned under o' 



Scyphidium F. E. ScH. (Nos. 5-8). 



Further treatment is given, in tliis contribution, to only 

 those genera and species knoNvn to me from Japanese waters. 



