YlU 



52, 31. Atops trilineatus is not allowed by S. A. Miller to be the same a^ 

 Ptychopariu trilineata., and will be retained by liini in his Cata- 

 logue. But if it be synonymous Atops has precedency over 

 Ptychoparia as a generic name. <^8. A.M.) 



52,28. Insert Athyrls ? 878-3 of Hicks' collections between Wetmore 



and Ludlow in McKean Co. Chemung, VIII g. 

 52, 30 and 32. Read Lower Cambrian. (G. F. M.) 



52, 33. Atops trileneatus has been placed by Walcott under Calymene 

 TriarthruSy Ptychoparia, and Conocoryphe, but it will not fit] 

 Why not retain the original name ? It belongs to the Paradox- 

 ides zone, the Middle Caynbrian of Walcott, but not the M, G. of 

 Sedgwick. (A. W. V.) 



For Vic read lie. 



For Cainarella, read Triplesla. (J. H.) 



For a&pera, read spinosa. A. aspera is a different and European 

 species. (R. P. \V.) 



For turkunde, read tenkunde. 



Erase from " Perry " to " xiii." 



For 100 and 300 , read 200 and 100 . 



Portage? (J. J. 8.) 



These two figures from Vanuxem are not of any Atrypa^ but repre. 

 sent Orthis impressa. (J. H. ; R. P. W. ; H. S. W.) 



Camarella coiigesta ? (J. H. ) 



Read Atrypa. It is a synonym of A. spinosus, Hall. (R. P. W. ) 



Read Reiisselseria. 



Atrypa exigua. This species has an internal process similar to 

 that of Centronella, showing it to be allied to that genus. (R. 

 P. W.) 

 55, 7. Atrypa extans. Not a Carnarella (which is a Pentameroid) but 

 on^ of i\\Q RhynchonellidiE. (R. P. W.) — After extans insert= 

 Triplesia extans. (J. H. ) 



55, 30. Atrypa iniplicata. The figure is not that of A. imb. of Hall, or 



Sowerby ; but apparently a Nucleospira. And the reference in 

 line 32 is incorrect. (J. H. ) 

 55,36. Atrypa impressa. For At ryi>a read Orthis. (R. P. W.) 



56, 2. For Atrypa intermedia read Whitfieldia intermedia, Davidson. 



(R. P. W. ) The first of the four figures is one of Atrypa imbri- 

 cata. (J. H. ) 



56, 15, 25 and 32. For Atrypa read Rhynchon^Ila in all three cases. (J. 



H. ; R. P. W. ; J. J. S.) 

 56,40. Read lieiorhynehus llmitare. (E. W. C.) 



57, 3. Read Leiorhynciins mesacostale. (E. W. C.) 



57, 5. For Atryim, read Meristella. (J. II.)— W^hitfieldia. (R. P. W.) 



57, 11. For Atrypa neglecta, road Rhynclionella. (J. H. and R. P. W.) 



57, 13. Insert next, Atrypa nodostriata. Specimen 507-15. 



57, 15. Read Bhynchoiiella. 



58, 12. Requires verification. (E. W. C. ) 



58, 19. For Lawrence Nille, read Lawrenceviile. 



58, 22. For Ilipparionyx consimilis, read Atrypa a,jjlinis. (J. H.) 



58, 28. For Ilipparionyx similar is, read consimilis. (J. H.) 



60, 32. Portage sandstone ? (J. J. S. ) 



61, 9. See corrections by R. P. W. on pages 53, 54 above. 



52, 



39. 



52, 



40, 



53, 



1. 



53, 



13. 



53, 



23. 



53, 



26. 



53, 



28. 



54, 



1 



54, 



13. 



54, 



19. 



i4. 



40. 



55, 



1. 



