PORIPHOEA. 



formed solely of horny threads ; mouths not open- 

 ing in elevated warts. 



S. pulchella. 



Hmbata. Fig. 5*. 

 laevigata. 



Dysidea (Johnston). Sessile, imperfectly cellu- 

 lar, shapeless, composed of a gelatinous membrane 

 containing particles of sand; spicula few, of no 

 certain figure. 



D. fragilis. 



papillosa. Fig. 6. 



Halisarca (Dujardin). Spreading as a thin 

 gelatinous crust on rocks and shells, semitrans- 

 parent, without spicula or distinct canals. 



H. Dujarclinii. Fig. 7. 



Grantia (Flem.). Firm, inelastic, usually white, 

 variously formed ; texture close, hut porous ; 

 spicula calcareous, simple and starred ; mouths 

 distinct. 



* Hollow. 



G. compressa. Fig. 8. G. pulveralenta. 

 lacmiosa. fistiilosa. 



ciliata. botryoid.es. 



** Incrusting. 



G. nivea. 



G. coriacea. 



