J. Chédeville. — Guide géologique au Fayel (Oise). 239 



linnrciformis, Cossm. 



verneuilensis, de Raine, et 

 M. Ch. 



bulimoïdes, Desh. 

 Pyrgulina Adams. 



Chevallieri, Cossm. 

 Belonidium Cossm. 



Morleti, Cossm. 

 Discobasis Cossm, 

 — Aciculina Desh. 



demissa, Desh. 

 Eulima Risso. 



subimbricata, Cossm. 

 Scalaria Lamk. 



crispa, Lamk. 



Godini, de Boury. 



acumiensis, de Boury. 



brevicula, DeSh. 



Bourdoti, de Boury. 



affinis, Desh. 



semicostata, Sow. 



Deslonchampsi, de R. et 

 M. Ch. 



fayellensis, de Boury. 



Gouldi, Desh. 



= propinqua, Desh. 



Chevallieri, Cossm. 

 Tenuiscala de Boury. 

 = Scalaria Lamk. 



Michelini, Desh. 



primula, Desh. 

 Arcisa Moch. 

 = Scalaria Lamk. 



auversiensis, Desh. 

 Aclis Leven. 

 ~ Scalaria Lamk. 



minutissima, Desh. 

 Adeorbis S. Wood. 



tenuistriatus, Desh. 



= mitis, Desh. 



int.er médius, Desh. 



bicarinatus, Lamk. 



=5 concava, Lamk. 



tricostatus, Desh. 

 Natica Adanson. 



Noœ, d'Orb. 



*Caillati, Desh. 



epiglottinoïdes, Desh. 



*perforata, Desh. 



lineolata, Desh. 



hantoniensis, Pilk. 



labellata, Lamk. 



Brongniarti, Desh. 

 Sigaretus Lamk. 



clathratus, Gmelin. 

 Ampullina Lamk. 

 = Natica Adanson. 



sigaretina, Lamk. 



parisiensis, d'Orb. 



abscondita, Desh. 



Edvvardsi, Desh. 



rustica, Desh. 



ponderosa, Desh. 

 Microschara Cossm. 

 = Sigaretus Lamk. 



citharella, Lamk. 



disjuncta, de R. et M. Ch. 



cliona, de R. et M. Ch. 

 Xenophora Von Valden. 



cumulans, Brong. 



patellata, Desh. 

 Capulus Montf. 



z=z Parmophorus, Blainv. 



dilatatus, Desh. 

 Capulus Montf. 

 = Pileopsis Lamk. 



squamseformis, Montf. 

 Calyptraea Lamk. 



aperta, Sol. 



=. trochiformis, Lamk. 

 Hipponyx Def. 



*cornucopiœ, Lamk. 



dilatatus, Lamk. 



*elegans, Desh. 



patelloides, Desh. 



— Heberti, Desh. 

 Cyclostoma Drap. 



mummia, Lamk. 

 Assiminea Leack. 

 = Bithinia Gray. 



contracta, Cossm. 



goniophora, Morlet. 

 Valvata Muller. 



Trigeri, Desh. 

 Paludina Lamk. 



inaspecta, Desh. 

 Hydrobia Hartm. 



— Bithinia Gray. 

 *subulata, Desh. 

 Chedevillei, Morl. 

 tuba, Desh. 



= Marceauxiana, Desh. 

 Bithinella Moch. Tend. 



— Bithinia Gray. 

 pulchra, Desh. 



Stenothyra Benson. 

 = Bithinia Gray. 



mediana, Desh. 



cuneata, Cossm. 

 Nystia Tourn. 



— Bithinia Gray. 

 microstoma, Desh. 



Rissoia Flemming. 

 Rissoa Freminv. 



nana, Lamk. 



Barreti, Morl. 

 Pseudotaphrus Cossm. 



— Rissoa Freminv. 

 buccinalis, Lamk. 

 cinctus, Desh. 



Rissoina D'Orb. 



Raincourti, Cossm. 



cochlearella, Lamk. 



fallax, Desh. 

 Chevallieria Cossm. 



mummiola, Cossm. 

 Solarium Lamk. 



patulum, Lamk. 



*canaliculatum, Lamk. 

 Discohelix Dunker. 



plicatella, Cossm. 

 Homalaxis Desh. 

 = Bifrontia Desh. 



Littorina Peruss. 



levata, Desh. 



Bernayi Cossm. 

 Risella Gray. 



— Trochus Lamk. 

 minuta, Desh. 



Lacuna Turton. 



Langlassei, de Raine. 



Loveni, Bayan. 



=== solidula, Desh. 



Bouryi, Cossm. 

 Dissochilus Cossm. 



conicus, Cossm. 

 Faunus Montfort. 

 =: Cerithium Adanson. 



*clavosus, Lamk. 

 Bayania M. Ch. 



lactea, Lamk. 



= dolosa, Desh. 



"delibata, Desh. 



r= frumentum, Desh. 



substriata, Desh. 



hordacea, Lamk. 



*= Bithinia, striatula, Desh. 



varians, Desh. 

 Turritella Lamk. 



sulcifera, Desh. 



*granulosa, Desh. 



*monilifera, Desh. 



interposita, Desh. 



copiosa, Desli. 

 Mesalia Gray. 



*incerta, Desh. 



*Heberti, Desh. 



= Raincourti, Desh. 



*solida, Desh. 

 Mathildia Saint-Père. 



— scalaria, Lamk. 



costellata, Desh. 



Bezançoni, de Boury. 

 Tuba Lea. 



— Littorina Ferussac. 

 sulcata, Pilk. 



Verinctus Adanson. 

 = Serpulorbis Sassi. 



*cancellatus, Desh. 



clathratus, Desh. 



semipedalis, Desh. 

 Tenagodes Guettard. 



— Siliquaria Brug. 

 *multistriatus, Def. 

 *mitis, Desh. 



Cerithioderma Conrad. 



— Mesostoma Desh. 

 angulatum, Desh. 



Planaxis Lamk. 



aulacophorus, Cossm. 



demidatus, Cossm. 

 Cerithium Adanson. 



*denticulatum, Lamk. 



Brochii, Desh. 



tuberculosum, Lamk. 



mutabile, Lamk. 



*Picteti, Desh. 



*tiara, Lamk. 



*tiarella, Desh. 



sequistriatum, Desh. 



