My. H. J. Carter on a new Species of Spongilla. 371 
contents, and surrounded by a little sponge-structure, in which 
the skeleton-spicules above described are found, one of which 
being microspined at once distinguishes them from those of 
Spongilla alba and S. Cartert, by whose statoblasts respectively 
and only they are frequently accompanied. As the specimen 
of Spongilla Cartert was taken from the tank (an old quarry 
in the Trap) in the month of October, and the living green 
herbaceous annual on which it was found grew near the edge, 
while the water of the ‘rainy season’ in the tank did not 
reach this until the end of July, the specimen of S. 
Cartert being globular and three inches in diameter, em- 
bracing the stem of the plant, it follows that this, together 
with every thing else that accompanied it, must have been 
developed there in less than three months. 
EXPLANATION OF PLATE XVI. 
N.B.—Figures 2, 3, 6,9, and 10, with all their detail, are relatively 
magnified on the scale of 1-24th to 1-1800th inch. The rest are more 
magnified. 
Fig. 1. Spongilla bombayensis, nu. sp., statoblasts in situ. Natural size. 
Fig. 2. The same. Section of the statoblast through the aperture. a, 
cavity filled with germinal matter ; 6, membrane enclosing the 
same; ¢, chitinous coat charged with statoblast-spicules; d, 
thick or external spiculiferous coat; e, aperture. Diagram. 
Fig. 3. The same. Statoblast broken open. a, germinal matter issuing ; 
6, chitinous coat charged with statoblast-spicules ; ¢, portion of 
thick or external spiculiferous coat; d, apertural tube of chiti- 
nous coat. Diagram. 
Fig. 4. The same. Portion of chitinous coat, more magnified, to show 
arrangement of the spicules with which it is charged. Dia- 
eram, 
Fig. 5. The same. Spicules of the statoblast generally, much more 
magnified. a, inner, 6, outer form. 
Fig. 6. The same. Skeletal and statoblast-spicules, relatively magnified. 
a, smooth, 6, spinous skeletal spicule; c, statoblast-spicules. 
Fig. 7. Spongilla alba. Sketch of “isolated” cell, with cilia waving 
internally, but no aperture; in appearance and size like the 
“ampullaceous sac,” viz. 1-700th to 1-560th inch in diameter. 
(Sketched March 1857.) 
Fig. 8. The same. Group of monociliated cells, consisting of :—a, mono- 
ciliated sponge-cell (spongozoon); 6, ? sperm-cell, zoosperm or 
spermatozoon; ¢, the latter attached to the former. (Sketched 
August 1854). 
Fig. 9. Spongilla segregata, Potts. Section of the quadrilocular statoblast 
near the centre, to show that it is tetrasporal. aaaa, stato- 
blastlets; 66006, chitinous coats of the same, respectively; 
cece, position of apertures of the same; dd, crust or cellular 
coat; ee, spiculiferous or external layer; 7f, single spicule of 
the latter, to show that it is spiniferous; ggg, apertural tu- 
bular prolongations of the “cellular coat,” opposite the stato- 
blasts respectively. Diagram. 
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