DESCRIPTION OF 





PLATE XIV. 



Fig. 1-5. SPIRIPEE GRIMESI. 604 



' 



1 a. Dorsal view and area of an entire specimen. 

 1 b. Profile view of the same. 



2. View of ventral valve of a specimen as it ordinarily appears in the lime- 



stone. 



3. Interior of a fragment of the ventral valve, showing the muscular and 



vascular impressions, with the low curving dental lamellae. 



4. Cast of the ventral valve, showing the form of the muscular impression 



and direction of the dental lamellae. 



5. Another similar specimen, showing a smaller muscular impression. 



The hinge -line in both these casts is proportionally more extended 

 than in the specimen fig. 1 a, b ; but the external features are similar. 



