DEVONIAN FAUNAS: 297 
DESCRIPTIONS OF SPECIES IN THE NEW ScoTLAND-BECRAFT FAUNA. 
COELENTERATA. 
SPONGIAE. 
HINDIA FIBROSA (Roemer). 
Plate XXXIII., Figs. 1-2. 
1883. Hindia fibrosa Hinde, Cat. Foss. Sponges Brit. Mus., p. 57, 
pl. 13, figs. 1-1 bd. 
1895. Hindia fibrosa Girty, 14th Ann. Rep. N. Y. State Geol. for 
1894, p. 263. 
Description —“Sponges globular in form, with an even, rounded 
surface and without peduncle or any point of attachment. The 
specimens vary between 13 mm. and 38 mm. in diameter. As seen 
in section through the centre, the growth of the sponge commences 
with a small, foreign body or even loose tissue in the centre, from 
which extend minute, straight canals, about 0.3 mm. wide, in close 
proximity to each other, to the outer surface. The canals are circular 
or polygonal in section; their walls are formed by the spicular skele- 
ton. The individual element of the skeleton appears to have a thick- 
ened, spherical centre, from which four to six short arms radiate in 
different directions, and by their attachment to the ends of adjoining 
spicular arms form a continuous, open, very regular mesh. ‘The 
spicular arms or rays appear to be either smooth or tuberculated. No 
special surface-spicules have been preserved.”—Hinde. 
Remarks.—This sponge has been observed in New Jersey only in 
the lower, cherty limestone member of the New Scotland beds. In 
most cases the spicular mesh surrounding the radiating canals has 
been dissolved, leaving only the empty mould. Such specimens are 
always siliceous, and may be easily recognized by their globular form 
and their radiate, spicular structure, which may be seen when the 
specimens are broken. Occasionally, however, specimens are preserved 
in the peculiar condition described by Girty, in which the radiating 
canals appear to be entirely surrounded by double walls, between which 
