McClung.] Microscopic Organisms of Upper Cretaceous. 427 



remains — all well preserved. The most prominent representa- 

 tive is Globigerina spinosa, which exists in some places to such 

 an extent as to almost entirely exclude the other forms. 

 Globigerina bulloides is also found in considerable quantities, as 

 is likewise Textularia globulosa. Orbulina universa is less promi- 

 nently represented than the other species. In addition to these 

 known forms there were in considerable numbers the re- 

 mains of another, which, for the lack of suitable literature, 

 could not be identified. Its resemblance to Gyroporella annulata 

 was very close, but the size of the specimens was much less. 

 On this account no name has been assigned to the form. 



In conclusion, brief mention may be made of the fact that 

 there are remains present in the rocks aside from the Forami- 

 nifera, such as would be expected. Among these the most promi- 

 nent are sponge spicules. For the sake of completeness, notice 

 may be given of certain round, yellowish bodies that were oc- 

 casionally seen in the empty tests of the Foraminifera. No 

 conception of their character could be formed. The yellow color 

 of the chalk may be in part or perhaps altogether due to this 

 substance. 



