Plate II. 



Fig ore 1. G. gracilis on Trochonema cf. ammonius, Hall. Natural size. 



Figure 2. Sulcus at the edge of C. gracilis, exterior view, a, surface film; b, second film 

 c, filling prism; </, side walls of groove. X 4. 

 Figure 3. The same, interior view, x 4. 

 Figi ke 4. The same, transverse section. x4. 

 Figure 5. C. gracilis. Natural size. 

 Figcrk 6. Enlarged sculpture. X 13. 



Figure 7. Conularia cf. gracilis, Hall, {Sphenotludlus angustifolius,lla.\\). s, sculpture of surface 

 discernible. Natural size. 



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