PLATE XIII. 



Fig. 



1. Cupularia denticulata, p. 85. 



a. Natural size. 



b. Anterior surface, magnified 25 diameters. 

 . c. Anterior sm-face, magnified 50 diameters. 



d. Posterior surface, magnified 25 diameters. 



e. Section, magnified 25 diameters. 



2. C. canariensis, p. 87. 



(Letters as above.) 



3. C. denticulata (worn condition). 



(Letters as above.) 



4. Lunulites conica, p. 88. 



a. a. Natural size. 



b. Anterior surface, magnified 25 diameters. 



c. Anterior surface, very much worn, magnified 25 diameters. 



d. Posterior surface, magnified 25 diameters. 



e. Section, magnified 25 diameters. 



5 . Cup ularia porosa, p . 87. 



a. Natural size. 



b. Anterior surface, magnified 25 diameters. 



c. Posterior surface, magnified 25 diameters. 



d. Fragments of larger specimens. 



e. Section, magnified 25 diameters. 



6. Lunulites conica (much worn). 



