320 WILSON. [Vour. IX. 
II. Aputt STRUCTURE AND GEMMULE DEVELOPMENT OF 
TEDANIA BRUCEI, N. SP. 
1. ADULT. 
Diagnosis. — Tedania Brucei, n. sp. Sponge body large, 
usually massive, though sometimes forming flat incrustations. 
Color red, and body firm and fleshy. Surface marked with 
shallow meandering furrows and low intervening ridges, the 
tissue of the ridges being firm, that of the furrows gelatinous 
and containing large canals. The dermal membrane contains 
microscleres (oxeas), and is perforated by numerous large 
rounded pores, both over the furrows and ridges, opening into 
subdermal cavities. Oscula usually large and conspicuous and 
often at the end of oscular papillae. The main efferent canals 
surrounded by a large amount of gelatinous tissue ; the body 
of the sponge is thereby broken up into an interlacing network 
of gelatinous and dense tracts. Flagellated chambers found 
only in the latter. Flagellated chambers open directly into 
afferent and efferent canals. The spicules include slightly 
curved strongyloxeas (Sollas) {2,9 to #7, mm. in length, tylotes 
with sharply nicked heads of same length, and very slender 
oxeas varying in length from 9°, mm. to microscleres of 
zi mm. and less. Skeleton of dense regions of sponge con- 
sists of a close and confused meshwork of strongyloxeas ; a few 
bundles composed of tylotes and oxeas, crossing the meshwork ; 
and brushes of tylotes supporting the dermal membrane, which 
in gelatinous regions give place to bundles of tylotes following 
curves of subdermal cavities. Gelatinous tracts contain scat- 
tered tylotes and oxeas, the latter from ;?,°, mm. to micros- 
cleres. Microscleres especially abundant round larger canals, 
often radially arranged. — Green Turtle Cay, Bahamas. 
This very handsome sponge is abundant in the quiet waters 
of the “‘sounds”’ or deep bays which run into the island. It is 
especially found on the roots of the mangrove, which grows 
luxuriantly round the borders of the sounds, though it may 
also be found on the bottom, where it is apt to become incrust- 
ing. Its large size, often ten inches in diameter, and bright 
