PLATE IV. 



CRETACEOUS SPECIES. 



Fig. 



1. 



Ted 



2. 



2*. 



3. 



Oabc 



4. 



4". 



4*. 



5. 



C a be 



6 to 13 



14. 



14'. 



15 to 28 



22. 



24. 



25. 



Trigonosemus elegans, the largest specimen yet discovered in England. 



Enlarged illustration. 

 Another specimen, nat. size. 

 The same, enlarged. 

 Nat. size. 

 Enlarged. 



Interior of smaller valve, enlarged. 

 Profile view of the same. 

 Interior of larger valve. 

 „ incerta, nat. size. 



„ „ Enlarged. 



Terebratula ovata, Sow., a variety of specimens of different shapes and ages, 



nat. size. 

 „ rugulosa, nat. size. 



„ „ Enlarged. 



Kingena lima, a series of specimens and variations. 



„ „ nat. size, and the largest specimen yet observed. 



„ ,, is the var. described under the name of T. spimdosa, the original 



specimen. 

 ,. ,, Interior of smaller valve, seen rather in front. 



