Mr. H. J. Carter on new aa d Subspherous Sponges. 181 
EXPLANATION OF PLATE XIII. 
Fig. 1. Tethya mie esci n. Sp., dia state, natural size ; upper sur- 
: e-like projectio 
epression in tho a centre externally has probably 
arisen L cols epe se of the vacuolar or canal-system internally 
Fig. 2. Phan iem horizontai section of the base oues d Juden - fom 
mfe 
PES abei ed in the fles m substan e: the i es 
: pid substance ; ; ee, cavities of the AOE -syst 
Fig. 3. The sam , imaginary sec ectio on, to show the vertical did of the 
cimen. 
Fig. 4. Tho armi segment, magnified a little more than two di n 
—Aa, spine-like projections ; b, dark cortical layer ; ¢ 
dinting® fe spicules See rom the centre to ‘is 
spine-like projections on the miferenee ; d, fleshy substance 
of the body ; e, cavities of t -sys 
Fig. 5. The same, portion ofthe sur Feed ipia irl toate times, showin 
re e relative position of the spine-like projections, with their 
ated ends, exposing the extremities of the spi- 
h the i 
im p whic ey are Ty s indicated by the black 
points; b, wing-like ridges of the pee layer of sarcode 
cu ag : : 
indicated by the lera poi 
Fu. 6. The same, a oec Lerma magnified, to show its dps 
state before the protruding ends of the s spicules were broken off. 
Fig. 7. The same, a of the radiating bundles, — ely magnified : 
a, straight, stout, smooth, fusi orm, acerate a b, real 
length, "about 1-7th of an inch, greatest thickness about 
tively. 
Fig. 8. The sam d e, body-spicule of the fleshy substance: short, stout, 
dioc nim slightly curved, acerate, gen larger on 
one side than the other; 1-30th to 1-20th o ng, an 
to 4-1800ths of an inch in its thickest a er. 
Fig. 9. The sa rtion of the fleshy substance, much magnified, to 
al bade nsely it is charged with the omnes idia spicules, 
