174 CLASS III.-ORDER I. 



liqucly rounded, and productive of smaller ; incrustcd 

 and punctured on one side. 

 Australasian sea. 



SCARIOLA. 



105. Spongia scariola. Expansions punctured and 

 dividing into a multitude of upright laminae, which are 

 soft, laciniated, lobed, and variously turned as if curled 

 or crimped. 



Southern seas. 



HETEROGONOUS. 



106. Spongia heterogona. Expansions upright 

 and flat, fibrous, slightly incrusted, and rolled back so 

 as to form imperfect tubes ; internally furnished with 

 longitudinal and detached nerves ; externally set w ith 

 points nearly resembling thorns, rather large, and nu- 

 merous. 



TIARA-SHAPED. 



107. Spongia tiaroides. Laminae upright and 

 bundled, rather thick, frequently coalescent, and much 

 lobed in the upper part ; lobes narrow , terminated in 

 a cone and set with points. 



SEAR-LEAF. 



108. Spongia ccerampelma. Stem short, and corky 

 in appearance ; expansions flat and foliaceous, oval 

 or oblong-oval, slightly incised and lobed ; nerves 

 projecting and forming a net- work ; honeycombed 

 oscules in the interstices. 



Var. B. More loose in form, expansions deeply 

 laciniated, and oscules more numerous. 



Northern and American seas. 



