EXPLANATION OF PLATE LXXXV. 



( Drawings by the author.) 



Pig. 1. A section of Textularia globulosa, showing the arrangement of the 

 chambers and the means of communication between them. X 150. 



Fig. 2. A section through one row of chambers in Textularia globulosa, indi- 

 cating a superficial resemblance to Nodosaria. X 150. 



Fig. 3. Surface view of Textularia globulosa, showing globular form of the 

 chambers. X 150. 



Fig. 4. Pigmy form of Textularia globulosa. X 330. 



Fig. 5. Appearance of Olobigerina bulloides in section, showing arrangement 

 of chambers, surface markings, thickness of wall, and crystalline contents. 

 X150. 



Fig. 6. Surface view of Globigerina bulloides, exhibiting the arrangement of 

 chambers and their shape. X 150. 



Fig. 7. Lateral view of Olobigerina spinosa, indicating the number and ar- 

 rangement of the chambers, and the surface markings of the shell. X 100. 



Fig. 8. Pigmy form of Oloberigerina bulloides. X 330. 



Fig. 9. Test of Orbulina universa. X 330. 



Fig. 10. Typical forms of Coccoliths, Rhabdoliths, etc. a, a, Coccoliths of va- 

 rious forms; b, b, Rhabdoliths; c, c, Sponge spicules. X 1000. 



