Devon and Cornvoall, Belgium^ the Eifel^ ^c. 397 
IV. Table of genera and species distinct in both limestones. 
In Wenlock limestone. 
Crustacea 3. 
Homalonotus delphinocephalus. 
Acidaspis Brightii. 
Bumastus Barriensis. 
Annelida 1. Sjnroi'bis tenuis. 
Mollusca. 
Cephalopoda 3. Nautilus undosus 
(Clymeiiia ? Munster). 
Lituites giganteus,L.? Biddulphii. 
Gasteropoda 2. Nerita spirata, N.? 
Haliotis. 
CoNCHlFERA 0. 
In Eifel limestone. 
Crustacea 0. 
Annelida 3. Serpula ammonia, S. 
omphalodes, S. socialis. 
Mollusca. 
Cephalopoda 12. Cyrtoceras de- 
pressum, C. compressum, C. 
annulatum, C. lineatum. 
Spirula nodosa, S. costata, S. an- 
nulata, S. carinata, S. dorsata. 
Goniatites subnautilinus, G. mul- 
tiseptatus, G. orbiculus. 
Gasteropoda 14. Turbo armatus, 
T. nodosus, T. cselatus. 
Trochus exaltatus. 
Pileopsis prisca, P. compressa. 
Sigaretus? rugosus. 
Rotella helicinaeformis. 
Phasianella ventricosa, P. bncci- 
noides, P. Fusiformis. 
Turritella biliueata, T. striata, T. 
obsoleta. 
CoNCHiEER a23, Gypidia gryphoides. 
(Terebratula gryplius, Schlot.') 
Strygocephalus Burtini (Terebra- 
tula rostrata, >Sc/ 2 /o^.),S.striatus. 
Calceola sandalina. 
Aptychus laevigatus. 
Pecten Neptuni. 
Pterinea radiata, P. elegans*. 
Modiola Goldfussii. 
Cardium alaeforme, C. elongatum. 
Lucina Proavia, L. lineata, L. 
rugosa. 
Cyprina minuta. 
Sanguinolaria concentrica, S. la- 
mellosa, S. dorsata, S. truncata, 
S. phaseolina. 
* M. Beyrich remarks that Pterineee are numerous, and in a manner 
• characteristic of the greywacke and slate rocks which support the Eifel 
limestone. Besides the two species noticed above, Professor Goldfuss 
enumerates the following as occurring in the greywacke and slate coun- 
tries adjacent to’the Rhine, namely near Ems, Pterinea ventricosa, P. costata^ 
P. lineata, P. plana, P. trigona, P. Icevis, P. elongata ; in Siegen (and the 
Harz) P. lamellom', near Iserlohn, P. reticulata-, and at Paffendorf (Coblenz) 
P. carinata. This last species occurs also, with P. bicarinata, at Lindlar, 
in the Berg territory. Of these fourteen species thus found in transition 
tracts, two only have been observed in the carboniferous limestone, viz., 
Pterinea elegans in theRatingen limestone, and P. carinata near Lewistown 
adjoining Niagara in North America. 
