COOKE : ON GEOGKAPHICAL DISTRIBUTION. 



115 



*ftModiolaria discrepans (Leach). 

 *itCre7iella decussata (Mont.). 

 *Linia elliptica, Jeff. 

 tJI/. suhauriculata (Mont.). 



*Limea sarsii (Lov.). 

 *\Asta7-te compressa (Mont.). 

 '\Arctica islandica (L.). 

 *Cryptodon croidiiiensis (Jeff.). 

 "* Cuspidaria abbrevinta (Forb.). 

 *Dentalium striolatum, Stimps. 

 *D. agile, M. Sars. 

 *iAcmcEa testudinalis (Miill.). 

 *itLepeta ccrca (Miill.). 

 L.fulva (Miill.). 

 *iPuncturella noachina (L.). 

 XEmarginula crassa, J. Sow. 

 *Propilidiiim ancyloide, Forb. 

 Rissoa albella, Lov. 

 iOnoba striata (J. Ad.). 

 ■fSkenea 2)lanorbis (Fabr.). 

 *-\ZLu)iatia jMllida (Brod. & Sow.), 

 L. viontagui (Forb.). 

 * ^ Amaxoropsis islandica (Gmel.). 

 iXVelutiiia Icevigata (Penn.). 

 *-f%V. flexilis (Mont.). 

 *Scala grcenlandica (Chem.). 

 CcEcuvi imperforatum (G. Ad.). 



* Trichotropisborealis,'Bxo(\i.&^ovi . 

 iBuccimim undatiiin, L. 

 B. humphreysianum, Benn. 

 Liomesus dalei (J. Sow.). 

 *'\%'Volutopsis norvegica (Chem.). 

 *Beringius turtoni (Bean). 

 iTritonofustis islandicus (Chem.). 



T. gracilis (da Costa). 

 ^ T . prop)inquus (Aid.). 

 T . fusiformis (Brod.). 

 Biiccinofusus berniciensis (King). 

 ft?,Purpura lapillus (L.). 

 *^Admete cotithouyi. Jay. 

 *'\X%Etimargarita helicina (Fabr.). 

 *tJS. grcenlandica (Chem.). 

 Solariella cincta (Phil.). 

 *\Calliostoma occidentale (Migh.). 

 ^+%Lacuna crassior (Mont.). 

 iLittorina obtusata (L.).^ 

 t+-L. rudis (Mat.). 

 \L. littorea (L.). 

 ■\Bela turricula (Mont.). 

 its. trevelyana (Tart.). 



Typhlomangilia nivalis (Lov.). 

 Tornatina nitidula (Lov.). 

 ^XBullinella alba (Brown). 

 fPhiline quadrata (S. V. Wood). 



* These species have seldom, if ever, been found south of the Wash, 

 t Also occurs in East North America. 

 X Also occurs in West North America. 

 § Also occurs in Japan and Kamschatka. 



The following members of the Britisli molluscmi fauna rank as 

 ' southern species ' (the list is not meant to be complete) : — 



Lepidopleiirus scabridus (Jeff.). 

 Acanthochites discrepans (Brown). 

 Barbatia lactea (L.). 

 Modiolus barbatus (L.). 

 Modiolaria costulata (Eisso). 

 Crenella rlwmbea (Berk.). 

 Pteria hirundo (L.). 

 Pinna fragilis, Penn. 

 Loripes lacteus (L.). 

 Divaricella commutata (Phil.). 

 Dipilodonta rotundata (Mont.). 

 Lepton sqxiamosum (Mont.). 

 L. sulcattilum, Jeff. 

 Galeomma turtoni, Brod. & Sow. 

 Ervilia castanea (Mont.). 

 Tellina sqiialida, Pult. 

 T. donacina, L. 

 Donax variegatus (Gmel.). 

 Mactra glatica, Born. 

 Lutraria oblonga (Chem.). 



Meretrix chione (L.). 



Venus verrucosa, L. 



Tapes decussatus (L.). 



Cardium aculeatuin, L. 



C. tuberculatum, L. 



Phasianella pullus (L.). 



Littorina neritoides (L.). 



Rissoa guerini, Reel., var. costulata. 



Aid. 

 Alvania cancellata (da Costa). 

 A. lactea (Mich.). 

 Ceratia proxhna (Aid.). 

 Setia pulcherrima (Jeff.). 

 S.fulgida (J. Ad.). 

 Gallodina carinata (da Costa). 

 Adeorbis subcarinatus (Mont.). 

 Truncatella truncata (Mont.). 

 Calyptrcea chinensis (L.). 

 Simnia patula (Penn.). 

 Erato IcBvis (Don.). 



■' North American, if palliata, Say, is to be regarded as a variety of 

 obtusata, L. 



