328 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 19, 



Cypricardia pectinifera, Morris. Ostrea inflata, Desk, 



Cardium semigranulatum, Sow. Dentalium strangulatum, Desh. 



obliquum, Desh. Turritella imbricataria (young) ? LamJc. 



Cardita elegans, Lamk. Myliobates. 



Nucula (Leda) Galeottiana, Nyst. Nipadites Burtini ; drilled by Teredince. 



Pecten plebeius, Lamk. 



In a sandstone cast of Nipadites (once regarded as a cocoa-nut by 

 Burtin) which retains perfectly its shape, we see the tubes of Teredines 

 in great numbers, these mollusks having evidently drilled the husk of 

 the floating fruit through and through. The occurrence of two spe- 

 cimens of this fossil in this bed, with Nummulites variolarius, Tellina 

 rostralis, Cypricardia pectinifera^ and other Laeken shells, shows 

 that the plant is referable here to a higher part of the series than 

 that in which it is found in the environs of Brussels, which, as we shall 

 afterwards see, is below the level of the Nummulites Icevigatus. In 

 the Sheppey clay the same Nipadites is seen to range still lower in 

 the Eocene series. 



That these fruits were drifted down to the sea is shown by their 

 being perforated by Teredince^ and I am informed by Dr. Hooker 

 that no fruits are so often met with floating down the arms of the 

 Ganges, in the delta near the sea, as those of Nipafruticans. They 

 are often so abundant that the paddle-wheels of steamboats are ob- 

 structed by them. 



(4.) Next below is a bed of whitish and yellow sand, 3^ feet thick, 

 containing in its upper part a bed of concretions of sandstone about 

 10 inches thick. The fossils are — 



Nummulites variolarius, Lamk. Lucina. 



Lunulites radiatus, Lamk. Solarium (Vermetus) Nystii, Gal. 



Tellina sinuata ? Lamk. 



(5.) "Nautilus-bed," Z\ feet thick. Grey and yellow sand, with a 

 bed of soft sandstone in nodules in the upper part, 1 foot thick, con- 

 taining 



Lucina (Loripes) divaricata, Lamk. Turritella. 



Pecten scabriusculus, Math. Nautilus Burtini, Gal. 



plebeius, Lamk. Crab's claw. 



Anomia laevigata, Sow. Vertebrae and teeth of Lamna. 



No less than four specimens of Nautilus, all perfect, though in a de- 

 composing state, were dug out of the bed when I was present. One 

 variety resembles N. imperialis in general form, but seems to be the 

 same species as N. Burtini. 



(6.) *' Cerithium ffiganteumhed;'* thickness 1 foot 8 inches. Yel- 

 lowish sand with grains of green earth, and containing in its upper 

 part an irregular bed of shelly sandstone, one foot thick ; both in the 

 loose sand and in the stone rolled pebbles of chalk-flints occasionally 

 occur. The fossils are — 



Nummulites variolarius, Lamk. Cardita elegans, Lamk. 



Lunulites radiatus, Lamk. Nucula margaritacea, Lamk. 



Turbinolia sulcata, Lamk. striata, Lamk. 



T. Nystiana ? Haime. Pecten scabriusculus, Math. 



Lucina mutabilis, Lamk. plebeius, Lamk. 



contorta ? Def. corneus, Sow. 



divaricata, Lamk. Ostrea flabellula, Lamk. 



Cytherea laevigata, Lamk, virgata, Goldf. 



