208 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



Table showing the numerical value of the species in the chief genera 

 of Actinozoa in Great Britain, Belgium, and America, the 

 former for European, the latter for American comparison. 















CO 





s 



fl 



■73 



d 

 a 



O 









03 



o 



Pi 



© 



mer 





 







OQ 



M 



PQ 



<\ 









b 



4 



/I 



4 



TO 





01 





2 



2 









6 





4 



o 



4 







"3 



1 K 



10 





4 





o 



Zi 



9 





Q 

 O 





A. 







4 



Q 

 O 





1 A 

 ID 





2 



1 





3 



*6 



12 





11 



5 



*6 



7 



3 



32 





2 



2 



1 







5 



Favosites 



6 



1 



3 



5 



*3 



18 





2 



6 









8 





16 



10 



12 



"4 



5 



47 





4 



2 





1 



1 



8 





4 



2 



"5 



4 



1 



16 





1 



2 





2 





■ 5 





2 











2 





5 



1 



"e 



"5 



"4 



23 





8 



10 



5 



21 



18 



62 





83 



57 



54 



71 



49 



304 



Echin"odeemata. — The class Echinodermata is represented in the 

 Carboniferous rocks by 4 orders — the Crinoidea, the Blastoidea, the 

 Perischoechinoidea, and the Echinoidea. The Holothuroidea through 

 the Synaptse occur also in a few localities. 30 genera and 163 

 species constitute the entire fauna, and the whole are in the Car- 

 boniferous Limestone division. Only 1 species (Archceocidaris Urei) 

 seems to be known in the Calciferous Sandstone. ~No species 

 appears in the Yoredale rocks ; indeed the entire class ceases to 

 appear above the Carboniferous Limestone, the 5 succeeding 

 divisions being utterly void of this class and the Coelenterata. The 

 Lower Limestone Shales through 11 genera yield 31 species — Actino- 

 Crinus 5, Archceocidaris 3, Astrocrinus 1, Atocrinus 1, Gyathocrinus 2, 

 Palcechinus 3, Platycrinus 10, Poteriocrinus 3, Rhodocrinus 2, and 

 Taxocrinus 1 species. Only 1 of the above is special or confined 

 to the Lower Carboniferous Limestone of Carlops, Peeblesshire, 

 Astrocrinites (Zygocrinus) Benniei, B. Ether., jun. 



The characteristic genera, and those containing the largest 

 number of species, are : — Actinocrinus 21 species, 5 of the 21 occur- 

 ring in the Lower Limestone Shale ; Gyathocrinus 10 species, 2 of 

 the 10 are also Lower Limestone Shale ; Platycrinus 25 species, 

 10 of which are in the Lower Limestone Shale ; Rhodocrinus 12 

 species ; and Archaiocidavis 10 species. The order Blastoidea, 



