472 Mr. J. G. Jeffreys oti the Conchologij of France. 



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

 de Conchiliologie' a rhnmc of French marine Conchology, in 

 an article entitled "Catalogue des Mollusques niarins 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 INlollusca 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 laud shells, which are not given by M. Moquin-Tandon. 



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



2. Trochus Montagui, Brit. Moll. 



3. umbilicatus, Brit. Moll. 



A. Lacmia putcolus, and variety, Brit. Moll. 



.5. vincta, Brit. Moll. 



G. Kissoa semistriata, Brit. Moll. 



7 . Skcnea planorbis, Brit. Moll. 



8. Odostomia plicata, Brit. Moll. 



9. obliqua, Brit. Moll. 



10. Rissoidcs, Brit. Moll. 



11. Otina Otis, Brit. Moll. 



12. Cerithioj)sis 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 Ilon- 

 fleur. I do not agree with M. L. Pfeiffcr, 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 andHoniieur. I mention this (to 

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

 as " Princi])alement la France mcridionale ." 



17. fusca, M.-T. (//. revelatd, Bouchard) ; Etretat. 



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



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



20. Rolphii, M.-T. ; Ilonfleur, Le Ilcve 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 67. Rolphii. 



I Montagu Square, London. Oct. 31st, 185fi. 



