PLATE XIV. 
Page. 
Fig. 1. Spirifer StrselccJcii, L. G. de Ivouiuck — Specimen, with shell preserved, seen 
from the dorsal side ... ... ... ... ... ... ... ... 183 
Fig. la. The same, seen from the ventral side ... ... ... ... 183 
Fig. 2. Spirifer pinguis, J. Sowerhy, var. rotiuidatus — Dorsal valve, seen from the front 185 
Fig. 2a. Internal cast, seen from the dorsal side ... ... ... ... ... ... 185 
Fig. 2h. Internal cast of the ventral valve ... ... ... ... ... ... ... 185 
Fig. 3. Spirifer vespertilio, G. Sowerby — Specimen, with shell preserved, seen from the 
dorsal side... ... ... ... ... ... ... ... ... ... 189 
Fig. 4. Spirifer triangularis, W. Martin — Ventral valve, seen from the front ... ... 191 
Fig. 5. Spirifer hisulcatus, J. Sowerby — Young individual, seen from the dorsal side... 192 
Fig. 5a. The same, seen from the ventral side ... ... ... ... ... ... 192 
Fig. ah. The same, seen in jmoflle ... ... ... ... ... ... ... ... 192 
Fig. 5e. Ventral valve of an adult specimen... ... ... ... ... ... ... 192 
Fig. 5c?. Internal cast of a ventral valve ... ... ... ... ... ... ... 192 
