136 Boycott : Manganese in Land and Fresh-water Mollusca. 



(2). — Limax fiavus, Agriolimax and Amalia give 

 moderate figures ranging from 0.5 to 36, 

 but the means arc under 10. 



Testacella maiigei 



T. haliotidea 



T. scutulum 



Limax maximus 



L. cinereoniger 



L. tenellus 



L. fiavus ... 



L. arbor urn. 



Agriolimax agrestis 



A. laevis ... 



Amalia sowerbyi ... 



A. gagates 



Vitrina pelliicida 



Hyalinia lucida ... 



H. cellaria 



H. helvetica {rogersi) 



H. alliavia 



H. nitidula 



Zonitoides nitidus 



Z. excavaius 



Arion ater 



A. subfuscus 



A. minimus [intermedi 



A. hortensis 



A. circumscriptus 



G'eomalaciis maculosus 



Pyramidula rotunda ta 



Helicella virgata 



H.'itala ... 



H. caper a ta 



H . gigavii (heripensis) 



Cochlicella barbara 



Theba caitiana ... 



T. cartusiana 



Aslifordia granulala 



Hygromia hispida 



H. rufescens (striolata 



Helicodonta obvoluta 



Helicigona lapicida 



Arianta arbustorum 



us) 





26 

 12 



6 

 10 

 30 

 29 



5 

 8 

 6 

 3 

 5 

 •24 

 21 



13 



14 



3 



6 



30 



19 



5 



17 



22 



4 

 4 

 4 

 3 

 I 



9 

 I 

 I 

 4 

 13 



0-7 



0-4 

 14 

 41 

 0-5 

 0-8 



0-5 

 1 



5 



2 



5 

 3 

 2 



3 



95 



I 



2 



05 



0-5 

 07 

 0-4 



0-3 

 07 



0-4 



0-2 

 03 



3 

 0-8 



39 



56 



107 



151 



36 



270 



23 

 25 

 13 



18 



3 

 23 

 123 

 133 

 145 

 199 



364 

 292 

 162 

 228 

 "3 



4 



2 



07 

 0-8 



07 

 I 



22 

 3 



2 

 07 

 21 



13 



48 



94 

 6 



58 

 9 

 9 

 6 

 6 



23 

 31 

 48 



35 



7 



173 



31 



54 



44 



29 



12 



64 



2 



I 



07 



0-5 



07 



0-8 



0-9 



2 



2 



04 



04 



0-8 



• 4 

 09 



(3). — Arion, Geomalacus and the other species of 

 Limax give high mean figures, but in 

 each species specimens have been examined 

 which gave quite h)w results (2 or less) 

 except in tenellus and cinereoniger. -4 



Naturalist 



