112 



TRANSACTIONS OF THE 



[Feb. 23 



however, are almost entirely absent. A bedded structure is 

 sometimes noticeable in tbe arrangement of the mica. Protozoan 

 tests or sponge gemmules complete enough to recognize are 

 rare ; only two or three were certainly observed. Larger tests 

 are more common, some referable to trilobites or ostracods, 

 others appearing in the section as narrow straight rods, 

 preserved in silica, often with a layer of phosphate at the edge. 

 Innumerable minute fragments preserved in calcite are very 

 likely comminuted tests of protozoa. 



Plate 1. Most of these appear to be ]\[onadUei<. Figs. 2 and 

 8 may be foraminifera, and also, perhaps, Fig. 10. 



