300 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 19, 



collections of the English species than had hitherto been at the disposal 

 of Belgian naturalists, which the kindness of Messrs. Morris and 

 Edwards enabled me to accomplish. 



Table VII. 



List of Fossils from the Clay of Rupelmonde, Boom, and Sehelle. 



Names of species. 



1. Corbula pisum. Sow. 



2. Lutrariaoblata?, S'om;. 



3. ErycinastriatulajiVyj?^. 



4. Axinus Nystii, Phi- 



lippi. 

 A. angulatus, De Kon. 

 Lucina Goodhallii'?, 



Sow. 



6. Astarte Kiekxii, Nyst. 

 6. Venus incrassata. Sow. 



7. Cardita Kickxii, Nyst. 

 C. glohosa, Sow. ? 



8. Leda Deshayesiana. 



9. Nueula archiacana, 



Nyst. 



10. — Chastelii, Nyst. 



11. Area decussata, Nyst. 



A. multistriata, De 

 Koninck. 



12. Pecten Hoeninghausii, 



Defr. 



13. P. Ryckholtii, Nyst. 



14. Ostrea paradoxa, iVysL 



15. Dentalium Kickxii, 



Nyst. 



16. Phorus Lyellianus, 



Bosq. 

 Trochus agglutinans, 



Nyst. 



Observations. 



Occurs in England in the Upper Marine, Isle 

 of Wight, in the clay of Barton, and in the 

 Bracklesham beds, 



M. Nyst considers this as a doubtful identifi- 

 cation from imperfect specimens, and pro- 

 poses the name of L. dubia. 



A shell imperfectly known. 



Mr. Morris observes that this shell is closely 

 allied to Lucina Goodhallii, Sow. (Geol, 

 Trans. 2 ser. v. tab. 8. fig. 7)* a London 

 Clay shell. It is probably, he says, only a 

 local variety. It is distinguished by the 

 deeper lunule, the more produced posterior 

 folds, and divided surface. 



M. Nyst does not feel sure of this identifica- 

 tion, and I could not obtain specimens to 

 compare with the British fossil. 



Perhaps a variety of C. glohosa. It is inter- 

 mediate, observes Mr. Morris, between two 

 varieties of that shell from Barton in the 

 collection of Mr. Edwards. The Belgian 

 shell is more depressed, and the ribs are 

 somewhat dififerently ornamented. 



Larger and thicker than Nueula amygdaloides 

 of the London clay, but in the young state 

 much resembling the English shell. 



Very rare ; only found as yet in Belgium. 



Also found at Hermsdorf, near Berlin. 

 A distinct species from A. duplieata, Sowerby, 

 with which M. Nyst originally identified it. 



A small, newly discovered species, alHed, as 

 I learn from M. Nyst, to Peeten ohsoletus 

 and P. sublcBvigatus, but " with flatter valves 

 and longitudinal stria3 more distinct." 



M. Nyst is now of opinion that this shell differs 

 from Trochus agglutinans, Lamk. It has, 

 he observes, a more conical spire. 



