246 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 25, 



The third reason, the subject of organic remains, requires a more 

 lengthened notice. On this point, the main evidence on which the 

 contemporaneity of the beds was considered to be established, con- 

 sisted in the occurrence of the following fossils in the Isle of Wight 

 and at Hordwell : — 



Limnsea columellaris, Soiv. 



■ longiscata, Brongn. 



minima, Soiv. 



maxima, Sow. 



pyraraidalis, Sow. 



fusiformis, Sow. 



Planorbis cylindricus, Sow. 



euomphalus, Sow. 



lens, Brongn. 



obtusus, Sow. 



roinndatus, Brongn. 



Ancylus elegans, Sotv. 

 Ancillaria subulata. Sow. 

 Melanopsis brevis, Sov). 



carinata. Sow. 



fusiformis, Sow. 



subulata. Sow. 



ancillarioides, Desh, 



Paludina lenta, Sovj. 



concinna*, Sow. 



angulosa, Sow. 



minuta, Sow. 



Melania costata, Sow. 



fasciata, Sow. 



minima, Sow. 



truncata, Sow. 



Nerita aperta. Sow. 

 Neritina concava, Sow. 

 Potamides acutus. Sow. 

 cinctus. Sow. 



Potamides concavus, Sow. 



duplex, Sow. 



margaritaceus. Sow. 



plicatus, Sow. 



ventricosus, Sow. 



rigidus. Sow. 



Fusus labiatus. Sow. 

 Murex sexdentatus, Sau\ 

 Helix globosus, Soiv. 

 Cerithium funatum. Sow. 

 Bulimus costellatus, Smv. 



ellipticus, Sow. 



Cyrena obovata. Sow. 



cuneiformis. Sow. 



pulchra, Sov). 



Corbula nitida, Soiv. 



— euspidata. Sow. 



Venus incrassata. Sow. 

 Mytilus affinis. Sow. 



Brardii, Fauj. 



Nucula deltoidea. Lam. 

 Potamomya plana. Sow. 



gregaria. Sow. 



Psammobia solida, Sow. 

 Tellina ambigua, Sow. 

 PoUicipes reflexus. Sow. 

 Unio Solandri, Sow. 

 Serpula tenuis, Sow. 

 Balanus unguiformis. Sow. 



To these I have to add the following : — 

 Infundibulum trochiforme, Lam. Voluta spinosa, Soiv. 



Melania mavginata. Lam. Ostrea flabellula. Lam. 



Venericardia (globosa?). Sow. (crepidula?), DesJi. 



Pleurotoma colon. Sow. Dentalium entale. Sow. 



In Mr. Bowerbank's collection I have also seen Sanguinolaria 

 compressa, Sow., Globulus dcpressus, Sow., Modiola elegavs, Sow., 

 and a Pupa ; in Mr. Edw^ards's collection the Cnncellaria evulsa. 

 Sow., Mitra pumila^ Sow., Psammobia solida. Sow., Lucina divari- 

 caia, Lam., with species of Scalaria, Turritella, Tellina, Nematura, 

 Helix, new sp., and other genera ; and in the collection of the Geo- 

 logical Society presented by Mr. S- Wood, we have Melanopsis buc- 

 cinoidea, Cyrena deperdita, Buccinum desertum, Neritina uniplicata, 

 and Natica glaucinoides. 



The former of these two lists appears at first sight sufficiently di- 



in the Paris basin all the marine formations have their synchronous freshwater 

 deposits — that they ai'e interpolated and not superimposed. For numerous eases 

 in point see his "Essai sur la Formation des Terrains des Environs de Paris," 

 Acad, des Sciences, 1827, and his numerous papers in the Bull, de la Soc. Geol. de 

 France. 

 * Probably the young of P. lent a. 



