752 
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fe 
Scientific Proceedings, Royal Dublin Society. 
EXPLANATION OF PLATES. 
Pratt X XVI. 
. Echinosphere. x 580. 
. Coccolith with proteid slime attached. x 1000. 
. Peltasphere. x 580. 
. Xanthidia. x 420. 
. Chain of urceolate chambers, each of which resembles an individual 
Diffiugia thalassia. x 160. 
. Test of Difiugia thalassia seen obliquely from below, showing the 
siliceous collar and delicate teeth. x 310. 
. Test of Tintinnus conicus. x 580. 
. Difiugia thalassia with pseudopodia extended. On the test is seem 
a coccolith among the grains of sand. x 310. 
Two individuals of Difiugia thalassia in conjugation. x 310. 
Various forms of spherical tests resembling Pyxidicula. x 310. 
Prate XXVIII. 
Ceratium tripos. x 310. 
Ceratium biceps, x 810. 
Ceratium fusus. x 310. 
Dinophysis acuminata. x 580. 
Dictyocha trifenestra. x 420. 
Ceratium divergens. x 310. 
Prorocentrum micans. x 580. 
