BIGSBI PALEOZOIC EOCKS OF NEW YOEX. 



259 



being, in fact, " Dredging-Tables" of the Silurian seas of Wales with 

 the adjacent English counties, and of the State of 'New York ; in other 

 words, they exhibit the mineral habitats of the old faunae and florae 

 of those regions, as far as is at present ascertained. They gradually 

 conduct the reader from the shores of the great sea of the time iato 

 the deeps of its remote centre, revealing its various populations as he 

 passes through a succession of strata — first conglomeratic, then gritty, 

 sandy, and argillaceous, until Kmestone more or less pure is reached ; 

 just as we find to obtain in seas at the present day. I only know of 



Table. V. — Exhibiting numerically, the Sedimentary Habitats of the 

 Silurian Fauna a^id Flora of the State of New YorJc. 





J 



Non -calcareous 

 Sediments. 



Calcareous Sediments. 



© 

















CD 















03 

















zc 













© 











W 



fl 











© 











rt 





Xi 





<a 



^ 



o 













1 







© 







(S 



Families 



and 

 Orders. 



=3 



o 



03 

 1 o 



o 



OS 



§ 

 W. 



} 



1 







1 







-2 



© 



s 







-1-2 







1 

 © 









'Z 



i "n 



3 



o 



s 



1 







05 



13 



m 



^ 







m 







© 



a5 





03 







O 



U 

 ^ 



o 



o 



I 



o 



r-H 



ID 



§ 



_o 







© 



1 — 1 



1 



. 



H 





^ 



o 



•hn 



o 



•S*n 



S 



-t-2 





 f— 1 







bd 







'So s 



s 



s 





02 



w. 



1 



^ 



^ 



^ 









H 



03 

 







^ 



S 



^ -^ 







5 



Plantse 



31 

 11 



8^ 



Is 



i 



18 

 2 

 8 









23 

 3 

 5 



3 



1 



9 



1 



4 

 5 



1 

 1 



17 



"^ 



5 1 



4 ... 



44 9 



11 

 10 



79 



34 

 13 



84 



Annehda 





1 



"9 



Zoopliyta 



Crinoidea 



49 

 4 

















8 



27 

 4 





9, 7 



51 

 4 



51 

 4 



Cystidea 

















Crustacea 



61 



68 



1 



2 

 4 



2 





3 



7 

 5 



2 

 4 



9 

 15 



10 



97 



v 



24 12 

 15 7 



57 

 69 



64 

 74 



Bryozoa 



Brachiopoda 



9M 



6 



7 





7 



4 



^4 



8 



19 



40 





152 23 



v>87 



^61 



Monomyaria 



44 

 49 



1 

 8 



4 

 10 





"i 



1 



6 

 14 



"4 



11 



9 



4 

 10 





14 11 

 14 6 



40 

 44' 



46 



58 



Dimyaria 



G"asteropoda 



94 



4 



9, 









6 



1^ 



8 



6 



^ 



33 32 



98 



99 



Heteropoda 



9,H 



1 







1 





^ 



?, 



4 





1 



13 4 



94! 



9e> 



Pteropoda 



8 

















9, 



9 





4 1 



9 



9 



Cephalopoda 



98 



9 



6 









8 



8 



7 



7 



9, 



56 20 



95 



108 



Total 



871 



1 



21 



1 



55 



2 



12 



10 



103 



36 



102 



156 



8 



387il33 



823 



926 



fossiliferous conglomerates and grits (Silurian) in Wales ; but they* 

 may exist in New York. It is to be remembered that in these cases, 

 according to Mr. Salter, the molluscs (creatures of later date) sought 

 the conglomerates. 



Although considerable similarity of aspect is presented by the 

 eastern and western Silurian areas, as exhibited in Tables Y.- VIII., 

 and especially as regards the numbers and distribution of animal 

 life, still we notice difierences quite as considerable. This may 

 be accounted for by the as yet much less perfect examination 



