250 PROCEEDINGS OF THE ACADEMY OF [1887. 



bent, cylindrical or subfiisiform, rounded at the ends, absolutelj 

 smooth or sparsely spiniferous, becoming more so towards the stato- 

 blasts where they are not more than half the size, thickly spined, 

 and in this shape form a distinct capsular layer around each of 

 those organs. Statoblast elliptical, ovoid ; aperture terminal ; crust 

 composed of granular microcell-substance, charged with inasquibi- 

 rotulate spicules consisting of a straight shaft passing by trumpet- 

 like expansion into the large disk, with two or more spines about 

 the centre, and furnished with a ring-like inflation towards the 

 disk ; disk circular, smooth, with even margin, which is somewhat 

 recurved, small end consisting of a circular umbonate head, regu- 

 larly denticulated on the margin, with 6-8 conical processes, which 

 are slightly inclined inwards or towards the shaft ; arranged perpen- 

 dicularly, so that the disk rests on the chitinous coat, and the head 

 or small end forms part of the surface of the statoblast." Carter. 



Loc. River Amazon. 

 (4) Tubella recurvata, Carter. Ann. and Mag. 1S81, p. 98. 



Spongilla recurvata, Bowerbank. Proc. Zool. Soc. etc. 1863, p. 

 456. 



Sponge "sessile, coating. Surface even. Structure fragile, crumb- 

 ling. Color brownish. Skeleton spicules curved, fusiform, abruptly 

 sharp-pointed, smooth or spiniferous. Statoblast globular ; aperture 

 infundibular ; crust thick, composed of granular microcell-sub- 

 stance charged with insequibirotulate spicules, consisting of a deli- 

 cate, straight, smooth shaft passing by trumpet-like expansion into 

 the large disk, which is circular, smooth, saucer-shaped, inverted, 

 with even margin, curved towards the shaft, and abruptly termina- 

 ting in the other, which is only one eighth of the diameter of the 

 disk, arranged perpendicularly with the large disk resting on the 

 chitinous coat, and the small one somewhat within the surface of the 

 crust ; surrounded by a capsule of short thick spicules, consisting of 

 a straight, smooth shaft, slightly inflated in the centre, and termina- 

 ted at each end by an equal-sized head, which is prominently um- 

 bonate, with circular margin regularly divided into eight conical 

 teeth slightly incurved, arranged perpendicularly around the stato- ' 

 blast, with one end free and the other adherent to the surface of 

 the crust." Carter. 



Loc. River Amazon; also Beni River, East Bolivia. 



