G. SPONGIA. 167 



BASKET-SHAPED. 



71. Spongia sportella. Formed by an union of 

 ligneous nerves, whitish or yellow, bare and smooth, 

 having the appearance of an open funnel-shaped 

 basket. 



Coast of Madagascar. 



PURSE-FORMED. 



72. Spongia hursaria. Mass fan-shaped, more or 

 less flattened, formed by three or five tubes or 

 purses, which are spongy, cuneiform, flattened, and 

 united by their narrow sides. 



TW^O -LEAVED. 



73. Spongia hilamellata. A short pedicle, rather 

 funnel-shaped, terminated by two large thin upright 

 expansions, which are parallel, approximate, and 

 fan-shaped. 



Var. B. Expansions nearly smooth externally. 

 Southern Ocean. 



CUP-FORMED. 



74. Spongia calix. Pediculated, upright, and re- 

 sembling a calix ; the internal cavity contracted by 

 gibbous irregularities. 



Southern Ocean. 



FIG-SHAPED. 



75. Spongia Jiciformis. Stiff and turbinated ; the 

 summit pierced. 



Coasts of Barbary. 



