170 CLASS III.— ORDER I. 



the form of a club, fibrous, and irregularly hollowed 

 on the outside. 



Var. B. Serai-proliferous, opening into a kind of 

 compressed calix, cavities larger and fewer. 



Kangaroo Islands, in Australasia. 



TUBULOUS. 



87. Spongia tubulosa. Branching, cylindrical, 

 irregular, waved, osculated, and with a few strong 

 hairs ; texture fibrous, rather finely reticulated. 



Indian ocean. 



PRICKLY. 



88. Spongia muricina. Tubes cylindrical and 

 nearly branching, long, and covered with sharp and 

 scattered tubercles. 



Var. B. Tubercles smaller and more numerous. 

 Seas of Australasia. 



CONJUNCT. 



89. Spongia confcederata. Tubes upright and nu- 

 merous, united in a mass that is rather thick and 

 compressed, the upper border being sometimes di- 

 vided in digitations ; some of the tubes adhering only 

 to the base of the mass. 



Seas of Australasia. 



INTESTINAL. 



90. Spongia intestinalis. Lobed, fibrous, stift*, and 

 internally hollow; lobes unequal, cylindrical, and 

 fistular, with holes or clefts. 



Mediterranean ; near Cettc, 



