ETHERIDGE — DEVONIAN ROCKS AND POSSIIS. 673 



Table IX. {continued). 



Species. 



North Devon. 



Pether- 

 win. 



o 



3 



z 



O 



1 



■a 





c 



.3 

 '3 

 o 



% 

 p 



1 



Goniatites subsulcatus 











* 

 •Sf 









^ 



Orthoceras cinctum, Sow 







cylindxaceum, Sow 







^ 

 * 



cylindricum, Sow 





^<- 



* 



* 

 * 



* 



ibex, Sow 





imbricatum, Wahl 







* 

 * 



lineolatum Phill 







Lude7ise ?, Sow 







Phillipsii, B'Orb 







tentaculare, Phill 







^ 



— ^ striatulum, Sow 







striatum Sow. . 







^ 









Nautilus meffasiph.0, Phill 

















fasciata, Phill 

















Miinsteri, iVf' Co V 









Pattisoni, M- Coy 

















quadrifora M' Coy 









sagittalis, PhilL 









striata, Munst 









valida, Phill. 









undulata Miinst 









Poterioceras f usiforme Sow 













6. O^Aer Groups. — It is unnecessary to carry our analysis of the 

 individual groups further, the paucity of the Lamellibranchiata and 

 Gasteropoda affording no means for our rigidly collating them either 

 mth the continental species or even amongst themselves in the two 

 Devonian areas ; and those species, in these classes, said to be common 

 to the Devonian and Carboniferous require yet much critical exami- 

 nation. I may, however, notice the genera CucuUcea, Curtonotus, and 

 Merjalodon, the latter as not being known out of the Middle Devonian 

 of South and North Devon, and the two former as being important 

 Upper-Devonian forms in the Marwood, Baggy, and Sloly beds. 



The whole group, however, of Devonian Lamellibranchiata contains 

 twenty genera and fifty-eight species, of which five genera and seven 

 species only occur in the Carboniferous series, viz. Avicula Damno- 

 niensiSyAvicidopecten plkatus, Conocardium cdiforme, CucuUcea amyg- 

 dcdinci, C. Hardingii, C. trapezium, and Curtonotus elegatis. 



The same difference exists between the two formations through 



VOL. XXIII. PAET I. 2 z 



