1G 



THIRD SUPPLEMENT TO THE CRAG MOLLUSCA. 



[Mr. Robert Bell, who has of late years very assiduously searched the Walton beds, 

 as well as examined several collections made by others from that locality, has kindly 

 furnished the following list of all the molluscan remains which he has been able to 

 detect there, beyond those given in the column for that place in my father's lists in the 

 first Supplement to his work. The species to which an asterisk is affixed are additions 

 to the mollnsca of the Upper Tertiaries of the east of England, given in the previous part 

 of this work, and are inserted solely on the authority of Mr. Bell. 



Gasteropoda. 



Erato laevis, Bon. 



Nassa labiosa, J. Sow. 

 — propinqua, J. Sow. 



Buccinum undatum, Linn 



Trophon consocialis, S. Wood (one speci- 

 men only, much worn, and 

 probably derivative) . 



— gracilis, Da Costa. 



— scalariformis, Gould. 

 Pleurotoma linearis, Mont. 



— turrifera, Nyst. 



— nebula, Mont. 



— rufa ? Mont. 

 Turritella planispira, S. Wood. 

 Chemnitzia communis,* ? Risso. (perhaps 



only a short form of C. inlernodula.) 

 Eulima subulata, Don. 

 Odostomia acuta, Jeff* 



Natica catena, Da Costa. 



— clausa, Brod. and Sow. (affinis. of 



Gmel.) 



— varians, Dujardin. 

 Vermetus intortus, Lam. 

 Trochus formosus, Forbes. 



— multigranus, S. Wood. 



— Adansoni, Payr. 



— tumidus, Mont. 



— Kicksii, Nyst. 



— Montacuti, W. Wood. 



— zizyphinus, Linn. 

 Emarginula crassa, J". Sow. 

 Tectura virgin ea, Mutt. 

 Dentalium dentalis, Linn. 



— rectum, Linn. 

 Actseon subulatus, S. Wood. 



— tornatilis, Linn. 



Bivahia. 



Mytilus edulis, Linn. 

 Modiola phaseolina? Phil. 

 Nucula nucleus, Linn. 



— Cobboldise, J. Sow. P 1 



Nucula tenuis ? Mont. 

 Cardita senilis, Lam. 

 Cardium fasciatum, Mom. 

 Cardium strigilliferum, S. Wooa. 



1 My father collected extensively at Walton at intervals during forty years, and Mr. Robert Bell also 

 very assiduously for many years past, without either of them having met there with the slightest trace of this 

 shell, so common in the later part of the Bed Crag ; but Mr. Bell has lately met with a single worn valve 

 in the collection made from Walton by Mr. Greenhill, of Vermont College, Clapton, on the authority of 

 which the shell is inserted with a note of interrogation in the above list. 



