TAB. XII. 



Fig. 



1. Lucina borealis, /?aye 139. 



2. Diplodonta astartea, /;. 146. 



3. Diplodonta rotundata, /(. 144. 



4. Loripes divaricata, /;. 137. 



5. Diplodonta dilatata,jo. 145. 



6. Lucina decorata, /I. 141. 



7. Lucina crenulata, /?. 140. 



8. Kellia suborbicularis, />. 118. 



a. orbicular variety, left valve. 

 A. transverse ditto, right valve. 



9. Kellia orbicularis, /j. 120. 



a, b. interiors of both valves mag- 

 nified. 

 c. outside view, natural size. 



10. Kellia coarctata,jO. 123. 



11. Kellia arabigua,j9. 120. 



a. trigonal variety. 



b. elliptical ditto. 



12. Montacuta substriata, //. 128. 



13. Kellia elliptica,/;. 121. 



b. united valves, showing the sinu- 

 ated form of hinge margin. 



14. Montacuta ferniginosa, /y. 129. 



15. Kelha pumila,/i. 124. 



16. Montacuta truncata, /«. 127. 



17. Montacuta bidentata, jB. 126. 



18. Hippagus verticordius, 7;. 150. 



19. Cryi^todon ferruginosum, /*. 135. 



20. Crj'ptodon sinuosum,/;. 134. 



The lines indicate the size of the specimens. 



