EXPLANATION OF PLATE VIIL 



(Figures all of natural size). 



By a mistake of the h°liotyper this plate was reversed and numbered backward. The following are 

 the corrected references: — 



SPIRIFERA PEDROANA, Hartt, sp. nov., page 237. 



5, 17, 18 and 21. Ventral valves of large size. In fig. 18 the dental plates 



are seen to be rather long. 

 4, 6, 9, 13 and 20. Ventral valves of medium "size. 

 8. Small ventral valve. 

 3. Ventral valve, somewhat larger than fig. 8, inclined slightly forward, so as 



to show the hinge area in part. 

 14. Hinge area of ventral valve, with the margins of the fissure partly broken 



away. 

 15 and 19. Large dorsal valves. 

 2 and 16. Dorsal valves of medium size. 

 SFIRIP^ERA ELIZAE, Hartt, sp. nov., page 239. 



I and 7. Ventral valves. Fig. i is the most perfect specimen yet found, 



while fig. 7 is much broken, and its dental plates are slightly curved. 

 SPIRIFERA VALEXTEAXA, Hartt, sp. nov., page 241. 



II. An interior mould of the ventral, valve the only specimen of this species 



obtained. 

 RHYNCHONELLA (STENOCISMA,) DOTIS, Hall, page 246. 



ID and 12. Dorsal valves. In fig. 10 the margins of the valve are partially 



obscured by the rock, in which it is embedded. 

 (All of the above specimens are interior moulds, j 



