PLATE XXVII. 



Orthis rugaeplicata. 

 Fig. 1-3. Dorsa*, profile and ventral view of a specimen. Page 44 



Orthis nisis. 



Fig. 4, 5. Ventral and profile view of a specimen. Page 42 



Cyrtia exporrecta. 



Fig. 6, 7, 8, 20. Dorsal, front, cardinal and profile view of specimen. Page 93 



Rhynchonella stricklandi. 



Fig. 9-11. Dorsal, profile and ventral view of a specimen. Page 81 



Fentamerus littoni. 



Fig. 12, 13. Dorsal and profile view of a specimen. Page 58 



Pentamerus complanatus. 



Fig. 14. Cardinal view of a specimen. Page 53 



Fig. 15, 16. Dorsal view of two specimen, showing variations in size. 



Spirifera rostellum. 



Fig. 17-19. Dorsal, ventral and front view of a specimen. Page 129 



