Fig. 
Fig. 
Fig. 
Fig. 4. 
Fig. 
Fig. 
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. Fig. 
Fig. 
t2 
PROF. OWEN ON A NEW SPECIES OF EUPLECTELLA. 123 
DESCRIPTION OF THE PLATE. 
Tin XXL. 
- Euplectella Cucumer, nat. size; with the foreign sponge and other bodies to which it is attached :— 
A. wall of the cylindroid, or parietal portion; B. terminal grating or lid; a. parietal orifices ; 
c. confluence of longitudinal fibres ; d. ibid. prior to forming the network of the lid; e. ibid. as 
the cylindroid contracts towards its attached end; A. resolved filaments, reflected from the 
attached body; o, o'. oblique fibres; p. prominent lines from the oblique fibres, chiefly due to 
the multiradiate accessory spicula; r. rim or thickened transverse line at the attached border 
of the lid; £. transverse fibres. 
- The opposite side of the attached end of the Euplectella ERE with the substance to which it 
adheres :—h. the free ends of the resolved filaments: nat. size. 
. The reticulate grating or soldered lid of the Euplectella Cucumer : nat. size. 
A closed and an open interspace of the meshwork, magnified four diameters:—a. the open 
space; 5. longitudinal fibres; ¢. transverse fibres; Å. superficial oblique fibres closing an inter- 
space ; 0. deep-seated fibres; o'. intermediate fibres. 
. Å multiradiate spiculum, from the place of intersection of the superficial oblique fibres, magnified 
eight diameters. 
. Portion of a barbed filament with its terminal anchor, magnified twenty diameters. 
. Transition of the barbed to the smooth structure in one of the filaments, similarly magnified. 
. Å portion of a sponge from the mass to which the Euplectella adheres ; natural size, and mag- 
nified ten diameters. 
. Another portion of sponge from the same mass; natural size, and magnified ten diameters :— 
9a. one of the squares of the harrow-like structure, magnified twenty diameters. 
