EXPLANATION OF PLATE IX. 



{Figures all of natU7'al size.) 



Tropidoleptus carinatxis, Con., (sp.,) page 254. 



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



Vitnliua pustulosa, Hall, page 255. 



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



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

 ones. 

 6, 11 and 32. Dorsal valves. Fig. 11 shows the impressions of the dental 

 plates. 



Streptorlijiiclius Agrassizii, Hartt, sp. uov., page 248. 



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

 served and sharp. 

 10. (lutta 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 2!). Rather large dorsal valves. 



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

 lines sharply preserved. 



Cliouetes Coiustockii, ILirtt, sp. uov., page 250. 

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



Spirifera Elizae, Ilartt, sp. nov., page 239. 



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

 cardinal extremity. 



Clioiictes 'I Hartt, sp. nov., i)age 253. 



24. A ventral valve, the only specimen found. 



(Unless otherwise stated, tin- alutvo siircinicns an' all of iiiterioi- moulds.) 



