1852.] LYELL BELGIAN TERTIARY FORMATIONS, 329 



Terebratula Kickxii, Gal. Echinolampas Galeottianus, E. Forbes ; 

 Solarium (Vermetus) Nystii, Gal. abundant in lower part of bed. 



Turritella edita, Sow. ; very abundant. affinis ?, E. Forbes. 



Cerithium giganteum, Lamk. ; abundant, Clypeaster affinis ?, Goldf. 



Cassidaria nodosa, Nyst. Crab's claw. 



carinata, LamJc. Vertebrae and teeth of Lamna. 



Nautilus Burtini, Gal. Myliobates. 



In the highest part of the bed, above the nodules of stone, Ceri- 

 thium giganteum occurs in great numbers with Turritella edita. 

 Nummulites variolarius is seen in the sand filhng the interior of the 

 Cerithia. Nummulites Icevigatus occurs, so far as I observed it, be- 

 low the stony bed, and marks the beginning of the beds where that 

 larger species abounds, although at the contact both might possibly 

 be detected in the same stratum. The Cerithium giganteum bed is 

 probably about the level of the line of junction of the " Laeken " 

 and "Brussels" Middle Eocene divisions hereafter to be described in 

 the environs of Brussels. 



(7.) ^^ Nummulites Icevigatus bed" (A, figs. 4 & 5) ; thickness \\ 

 foot. This bed consists in parts of a hard greenish sand- rock, con- 

 taining Nummulites Icevigatus and N. scaher, and partly of incoherent 

 sand with green grains, with the same species of Nummulites loose 

 and disseminated. The molluscs mentioned in the following list oc- 

 cur both in casts and as shells in the sand. The teeth of Sharks are 

 numerous. 

 Nummulites Isevigatus, Brug. ; very Ostrea flabellula, Lamk. 



abundant. virgata, Goldf. 



scaber, Lamk. ; very abundant. cymbula, Lamk. 



Gastrochaena. Terebratula Kickxii, Nyst. 



Crassatella. Natica ; two species. 



Cytherea laevigata, Lamk. Turritella imbricataria, Lamk. 



Lucina mutabilis, Lamk. Asterias (Goniaster) poritoides ?, Besm. ; 



Cardium semigranulatum. Sow. marginal ossicles. 



porulosura, Brander. Echinolampas Galeottianus, E. Forbes. 



Cardita planicostata, Lamk. Lamna elegans, Agass. 



Pectunculus. Otodus macrotus, Agass. 



Nucula Galeottiana, Nyst. Myliobates. 



Prof. E. Forbes, on my explaining to him the relative abundance 

 of the shells in this and most of the incumbent beds at Cassel, is of 

 opinion that they were probably deposited in a depth of about 15 fa- 

 thoms, or at the lowest part of his '' perilittoral zone." 



(8.) " Oyster-bed ;" thickness 5 feet. Yellowish and greenish-grey 

 sand, with great numbers oiOstrece {O.flahellula) dispersed through it. 



(9.) Bed of hard sandstone with calcareous cement ; thickness 

 1 foot 6 inches , containing 



Nummulites scaber, Lamk. Ostre* flabellula, Lamk, 



Corbula gallica, Lamk. Deutalium strangulatum, Besh. 



Thracia. Stomatia. 



Mactra semisulcata, Lamk. Melania marginata, Lamk. 



Tellina. Fusus bulbiformis, Lamk. 



Cytherea laevigata, Lamk. Buccinum stromboides, Herm. 



Lucina (Loripes) divaricata, Lamk. Rostellaria fissurella, Lamk. 



Cardium ; Uke C. discors, Lamk. macroptera, Lamk. 



Cardium porulosum, Brander. Conus deperditus (young) ?, Brug. 



Cardita planicostata, Lamk. Terebellura. 



Pectunculus. Asterias. 



