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 Fig. 1. PiiOLADOMYA SL'iJELOKGATA ; reduced to less than tvTc-tliirds the natural 



diameter ' 362 



1 a. Dorsal view of same. 



Fig. 2. Goniomya borealis 362 



A left-side view, reduced in the same way. 

 Fig. 3. Thracia ? occidextzVLis ; reduced as above = 363 



3 a. Dorsal view of same. 



Fig. 4. Thracia? subtruxcata ; reduced in same way 3C3 



4 a. Dorsal view of same. 



Fig. 5. Cyprijieria? tenuis ; mould of exterior surface left in matrix, reduced 



in size — . — 3C1 



f) a. An internal cast of a smaller specimen ; reduced. 



5 1). Profile of same. 



Fig. 6. Arca equilateralis ; side view of an internal cdst, showing muscular 



impressions and traces of radiating strite, reduced in size as above. . 357 



6 a. Dorsal view of same species. 



Fig. 7. Trigoxia evansi ; side view of the original imperfect specimen, reduced 



in size, and retaining portions of the shell 359 



7 a. Side view of a gutta-percha cast, tahen from a nearly perfect mould 



or impression left in the rock ; reduced in size. 



7 Z). A dorsal view of a cast from a mould left in the rock ; reduced in 



size. 

 Fig. 8. Mactra gibbsaxa; reduced in size (age doubtful) 374 



8 a. Portion of an internal cast, showing the posterior muscular impression 



and the pallial line of same species ; reduced as above. 

 8 I. Outline anterior view of same species. 



