ECHINODERMATA. 
281 
diameter of the disk, very slender and tapering. The zoophyte to 
"kich Lamarck gave the name of Opliiura fragile has now its place 
a mong the Ophisthrix, the specific name, indicating a particularity of 
s taucture in all these small creatures derived from their fragile formation. 
short, these beings have so little consistency that they crumble, as 
lt Were, under the touch, and become reduced to pulp under the 
8 %htest pressure. In Fig. 110 we give the representation of an 
^Phiura of the natural size, which Lutken has since called Ophiocoma 
Fig. 111. Astcrophytou vcrrucosum (Lamarck). 
n 
fir 
' Us $ei. This Echinoderm, which lives in the seas of the Antilles, is 
Wished with five very flexible rays, which are armed with from 
tt'i'ee to four rows of spines, those on the upper part of the body being 
J er y hard ones ; the body and arms of this creature are of reddish 
Jl ’°Wn, streaked with a great number of little white lines. 
■fhe principal type of the Euryalina is the curious and complex 
^rophyton verrucosum of Lamarck. They include animals remark- 
able for the extremely complicated development of their arms— the 
