472 Mr. J. G. Jeffreys on the Conchology of France. 



Finisterre; and M. Petit de la Saussaye has given in his ' Journal 

 de Conchiliologie ' a resume of French marine Conchology, in 

 an article entitled " Catalogue des MoUusques marins qui vivent 

 sur les Cotes de France/' This Catalogue was published in 1851 ; 

 but it is too meagre to offer a satisfactory comparison between the 

 French and our own Conchology, especially as regards the minute 

 species. M. Moquin-Tandon's admirable work, which has lately 

 been published, on the Land and Freshwater Mollusca of France, 

 may be safely consulted for that branch of the subject. 



My dredging at Etretat was a complete failure, as the sea- 

 bottom for many leagues seemed to be composed of nothing but 

 flint pebbles ; and the shore was nearly as unproductive. The 

 only uncommon species I obtained was Otina otis; and of this 

 only a single specimen occurred to me. 



I will now enumerate the marine Testacea I found, and which 

 are not included in M. Petit's Catalogue, as well as the localities 

 for a few land shells, which are not given by M. Moquin-Tandon. 



1 . Montacuta bidentata, Forbes and Hanley^s Brit, Moll. 



2. Trochus Montagui, Bint. Moll. 



3. umbilicatus, Brit. Moll. 



4. Lacuna puteolus, and variety, Brit. Moll. 



5. vincta, Brit. Moll. 



6. Rissoa semistriata, Brit. Moll. 



7 . Skenea planorbis, Brit. Moll. 



8. Odostomia plicata, Brit. Moll. 



9. obUqua, Brit. Moll. 



10. Rissoides, Brit. Moll. 



1 1 . Otina Otis, Brit. Moll. 



12. Cerithiopsis tuberculare, Brit. Moll. 



13. Nassa varicosa, Brit. Moll. M. Petit refers to this as a synonym 

 of N. incrassata, which is also common on the French coast. 



14. Zonites glaber, Moquin-Tandon; Etretat, Lillebonne, and Hon- 

 fleur. I do not agree with M. L. Pfeiffer, that the Z. alliarius 

 of British authors ought to be united with this species. 



15. striatulus, M.-T. (Z. radiatulus, Brit. Moll.); St. Clair 



near Etretat. 



16. Helix aspersa, M.-T. ; Etretat and Honfleur. I mention this (to 

 us common) species, because M. Moquin-Tandon gives its habitat 

 as ** Principalement la France meridionale.^' 



17. fusca, M.-T. {H. revelata, Bouchard) ; Etretat. 



18. limbata, M.-T. ; Honfleur and Lillebonne. 



19. Clausiha nigricans, M.-T. ; Etretat. 



20. Rolphii, M.-T. ; Honfleur, Le Heve near Havre, and Lille- 

 bonne. I observe that Mr. Benson has modified his opinion 

 as to the CI. Mortilleti of Dumont being a distinct species. 

 M. Moquin-Tandon gives it as a synonym of CI. Rolphii. 



1 Montagu Square, London, Oct. 31st, 1856. 



