1852.1 



LYELL BELGIAN TERTIARY FORMATIONS. 



305 



near Antwerp, already described, which (allowing; for the small num- 

 ber of species in each) affords decisive palseontological evidence of 

 their contemporaneous origin : — 



Axinus Nystii. 

 Venus incrassata. 

 Natica glaucinoides. 

 Fusus elongatus. 

 Pleurotoma crenata. 



flexuosa. 



Murex Deshayesii. 



Typhis cuniculostts. 

 Triton argutum. 



Tritoniumflandricum. 

 Rostellaria (Chsenopus) Margerini. 

 Cassidaria depressa. 

 Voluta semiplicata. 



Of the eleven species of Entomostraca above referred to, several 

 are common to Rupelmonde, Boom, &c. 



Next in the descending series we enter on the Middle Limburg 

 beds, or the Bergh sands, «, Table VIII. By reference to the accom- 

 panying section, fig. 2, it will be seen that the first fossiliferous bed, by 



Fig. 2. — Section of the Bergh Sands {a, Table VIII.) at Berghj near 

 Kleyn Spawen. 



ft. in. 



a'. Nucula-loam 2 



«. White sand without shells 2 



b . Pectunculus-bed 1 6 



e. White sands without shells 4 



d. Shelly sand with Cerithia 6 



e. Sand without shells 1 6 



/. Shelly sar.d with Cerithia 1 



g. White sand with few shells {Cyprina Nystii). 



Not exposed. 



of this division is called the Pectunculus-bed, from the extraordi- 

 nary abundance in it oi Pectunculus fossilis, Kon. (P. terehratularisy 

 Lamk.). The following are the shells which have been met with : — 



Fossils of the " Pectunculus-bed 



Corbula Henckeliusiana. 

 Astarte Henckeliusiana (2). 



trigonella. 



Lucina tenuistria. 

 Cyprina islandica ? 



Nystii. 



Venus laevigata (1). 



incrassata. 



Cardita Omaliana. 

 Pectunculus fossilis (6). 



pulvinatus (2). 



Limopsis Goldfussii (1). 



at Berghy near Kleyn Spawen. 



Pecten Hoeninghausii (2). 



Deshayesii. 



Dentalium acutum (1). 

 Infundibulum striatellum. 

 Trochus Kickxii. 

 Natica hantoniensis. 

 Voluta Rathieri. 



Myliobates. 

 Lamna contortidens. 

 cuspidata. 



