PLATE XXVI. 



Lingula triangulata. 

 Fig. 1. Ventral view of a specimen. Page 34 



Spirifera medialis. 



Fig. 2-5. Cardinal, ventral, dorsal and profile view of a specimen. Page 125 



Rhynchonella acinus. 



Fig. 6, 13, 14. Dorsal, profile and front view of a specimen. Page 73 



Froductella semiglobosa. 

 Fig. 7. Ventral view of a specimen. Page 70 



Murchisonia desiderata. 



Fig. 8. View of an internal cast of a specimen, which is entirely cov- 

 ered by an incrusting coral, studded with somewhat irregularly 

 distributed tubercles. Page 169 



Bucania devonica. 



Fig. 9. View of an internal cast. Page 160 



Modiomorpha alta. 



Fig. 10. Left view of a specimen. Page 217 



Pleurotomaria casii. 



Fig. 11. Dorsal view of a specimen. Page 171 



Pleurotomaria arabella. 



Fig. 12. Apertural view of an internal cast retaining a small portion 



of the test. Page 171 



