EXPLANATION OF PLATE IX. 



{Figures all of natural size.) 



Tropidolcptns carinatusj Co7i., (sp.,) page 254. 



1 and 9. Ventral valves. In fig. 1 the plications are very indistinct. 



Vitulina pustulosa, Hall, page 355. 



2, 7, 8, 12, 13, 15, 20, 21 and 27. Ventral valves. In figs. 7, 8 and 15, there 



are three medium sized plications on the fold, instead of two large 

 ones. 

 G, 11 and 32. Dorsal valves. Fig. 11 shows the impressions of the dental 

 plates. 



Streptorhyiichus Agassizii, Hartt, sp. nov., page 248. 



10. Small ventral valve, on which the radiating raised lines are well pre- 

 served and sharp. 



16. Gutta percha impression of an exterior mould of a large ventral 

 valve. 



17. Very large ventral valve. 



23, 26 and 28. Ventral valves of medium size. 



3, Dorsal valve, medium size. 



4, 25 and 29. Eather large dorsal valves. 



30. Interior and exterior moulds of small dorsal valves, with the raised 

 lines sharply preserved. 



Clionetes Comstockii, Hartt, sp. nov., page 250. 



5, 14, 18, 19 and 31. Ventral valves. 



Spirifera Elizae^ Hartt, sp. nov., page 239. 



22. Fragment of ventral valve, from the dental plate of left side to left 

 cardinal extremity. 



Clionetes 'I Hartt, sp. nov., page 253. 



24. A ventral valve, the only specimen found. 



(Unless otherwise stated, the above specimens are all of interior moulds.) 



