PLATE IV. 



Page 

 Fig. 1. Verruculina convoluta, Quenst. sp. Natural size. From the Upper Chalk at 



Flamboroughj Yorkshire 38 



Fig. 1 a. The same. Portion of the surface of the interior of the cup, showing the minute 

 pores. Natural size. 



Fig. 1 b. The same. The interior surface. Enlarged four times. 



Fig. 1 c. The same. Portion of the surface of the exterior of the cup, from the same spe- 

 cimen. Natural size. 



Fig. 1 d. The same. Enlarged four times. 



Fig. 2. Verruculina plicata, Hinde. Natural size. Prom the Upper Chalk at Flam- 

 borough 36 



Fig. 2 a. The same. Portion of the surface of the interior of the cup. Natural size. 



Fig. 2 b. The same. Enlarged four times. 



Fig. 2 c. TTie same. Portion of the surface of the exterior or outer wall of tlie same spe- 

 cimen. Natural size. 



Fig. 2 d. The same. Enlarged four times. 



