174 
CLASS III. — ORDER I. 
liquely rounded, and productive of smaller ; incrusted 
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 heterogotia. 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 with 
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 xerampelina, 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 ; honey- combed 
oscules in the interstices. 
Yar. B. More loose in form, expansions deeply 
laciniated, and oscules more numerous. 
Northern and American seas. 
