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The greater part belong to the Ostreidae-, the smooth and flat 
fragments can be classed to the genus 0street, the severely folded 
and ribbed ones to Alectryonia. Among the latter Alectryonia gregaria 
Sow. may be represented. A fragment from Reuver suggests the 
delineation of Trigonia costata Park. Among the other fragments a 
radially ribbed printing reminds of Cardium , the rest however is 
totally irrecognisable. 
Of Gastropoda I possess nothing else but the top of a real 
Nermea-sheM, from the clay-pit near Reuver, with distinct groove- 
line (“Sehlitzband”). 
Finally of the Cephalopoda some fragments of Belemnites are at 
hand. The upper end of the rostrum of Belemnites hastatus Blainv. 
with alveole, found near Reuver, is rather well recognisable. 
The other fragments are very small and show no characteristic 
properties. 
Summing up what is mentioned higher up we have the following 
list of fossils: 
Miliolidae? 
Spongiae : Cnemidiastrum stellatum GoldIf. sp. f 
Eusiphonella Bronni Mst. sp. ? 
Anthozoa : Thamnastraea prolifer a Becker. 
Favia sp. ? 
Crinoidea : Apiocrinus 
Millericrinus ( f.i. M. horridns d? Orb.) 
Pentacrinus sp. ? 
Echinoidea : Cidaris flongemma Phill. 
Vermes: Serpula Umax Gold/.? 
Serpula convoluta Gold/. ? 
Bryozoa 
Brachiopoda : Rhynchonella Thurmanni Voltz. 
Lamellibranchiata : Ostrea sp. ? 
Alectryonia sp. ? 
Alectryonia gregaria Sow.? 
Trigonia costata Park.? 
Cardium P 
Gastropoda : Nerinea sp. ? 
Cephalopoda : Belemnites hastatus Blainv. 
This fauna points without any doubt to an origin from younger 
jurassic strata, though few species can be identified with certainty- 
The fixing of the geological age by Schluter and Fliegel of the 
fossils from the places in the Lower Rhine basin (Duisdorf near 
Bonn, Weilerswist, browncoalmines Liblar and Donatus near Bru 
etc.) appears to be also correct for those from the places in Limburg 
and North-Brabant, situated further to the North-West. 
