JOURNAL OF MICROSCOPICAL SCIENCE. 
EXPLANATION OF PLATE XVIII. 
Illustrating Prof. Cienkowski’s Memoir on the production of 
Spores in the Radiolaria. 
All the figures, with the exception of 9—12, are drawn by aid of the 
prism. The enlargement is given in brackets. In all the figures, K de- 
notes the capsule; P, the radiant protoplasm; QO, the oil globule; G, the 
fenestrated shell. 
1—6.— Collosphera Huzleyi, Miller. 
Fig. 
1.—A young naked capsule, without a fenestrated shell enclosed in the 
radiant protoplasm (180). 
2.—An adult capsule shut in its fenestrated shell (180). 
3, 4.—Shell-enclosed capsules, with protoplasm passing outwards (180). 
5.—Many vesicles arise in the capsule-contents (480). 
6.—Further differentiation of the contents into the corpuscles, c. In 
this, as in the last figure, the shell is not drawn. 
7—15.—Collosphera spinosa, Hackel. 
7. The capsule-content breaks up into a number of corpuscles (180), 
8.—The out-swarming of the zoospores (180). 
9, 10.—The zoospores (180), 
11, 12.—Zoospores killed with iodine (600). 
13—15.—Capsule-contents observed in the act of division (480) 
16—30.—Collozoum inerme, Hickel. 
16.—The capsule-content breaks up into large masses (180). 
17.—Radially-arranged content-balls (180). 
18.—The corpuscles, observed in the act of division, of which the large balls 
are made up (480). 
19.—The capsules squeezed together, forming parenchyma-like ag- 
gregates. 
20—23.—The young capsules multiplying by constriction and division : 
20, the common biscuit-form; 21, bent-up capsule with two con- 
strictions ; 22, a capsule broken up into four parts; 23, a very 
long capsule about to divide. 
24.—A capsule surrounded by many vesicles (the young capsules?) which 
apparently have arisen directly from the protoplasm; 4, ¢, the 
same observed in division. 
25—380.— Various forms of the yellow cells, and their sheath growing after 
the death of the colony; 4, the sheath (760). 
