Manganese in Land and Fresh Water Mollusca. 13 



Zonitoides nitidus. Aldenham 10. 



Z. excavatus. Portmadoc, Carnarvon (top of old stone wall, 

 among dead leaves) 127 ; Romiley, Cheshire (under stones 

 in wood) 185. Mean 156. 

 Avion ater. Aldenham (roadside) ater 4-4, 1-3 ; albus i-o, 1-4 ; 

 Monk's Risborough, Bucks (roadside) ater i-o ; Hampden, 

 Bucks, (fungi in beech wood) reticulata 47. Mean, 9 or 

 (excluding the high figure), 2. 

 A. sitbfuscus. Hampden (beech trees) cinereofusca 274. 

 A. hortensis. From gardens: — Aldenham 4, 5 ; St. Albans 8; 

 Hereford 12; Holmer 6; field: — Aldenham 3. Mean 6. 

 Helicella virgata. Thurlestone, Devon 0-7. 

 H. itala. Aldbury, Herts 0.4. 



H. caperata. Aldenham (off beech trees in wood) 0*5 ; Monk's 

 Risborough, Bucks, (grass) trace ; Prestatyn, Flint (grass) 

 07. Mean 0-5 ca. 

 H. gigaxii. Aldenham (grass) o-8 ; Prestatyn (grass) o-8. 



Mean o-8. 

 Cochlicella barbara. Thurlestone, Devon, trace. 

 Theba cantiana. Aldenham, five loci 0-4, 07, 0-9, i-o, i-i ; 

 Hereford, trace ; Monk's Risborough i-o. Mean o-8 ca. 

 T. cartusiana. Lewes 2. 



Hygromia grannlata. Long Lane, Middlesex 2. 

 H. hispida. Aldenham, three loci, trace, trace, nil ; Ludlow 



07. Mean 0-3 ca. 

 H . rufescens. (a) gardens, Hereford nil ; Andoversford, 

 Gloucester 0-3 ; Aldenham 0-2 ; (b) roadsides, Portmadoc, 

 trace ; Brock, Lanes, nil ; Doward, Hereford 0*4 ; (c) beech 

 woods, Hampden o-6 ; Cranham, nil. Mean 0-2 ca. 

 Helicodonta obvoluta. Ditcham, Hants., nil (less than 0-9). 

 Helicigona lapicida. Symond's Yat, Gloucester (1913) 6 ; 

 ditto. (1915) 12 ; Monk's Risborough, Bucks., trace ; 

 Cranham, Gloucester, trace. Mean 5 ca. (?). 

 Arianta arbustorum. Aldenham, trace 0*3 ; Miller's Dale, Derby 



o«3 ; Symond's Yat, Gloucester 1*3. Mean, o-6 ca. 

 Helix aspersa. Aldenham, three garden loci 0-4, 1.5, 1*6 ; 

 Miller's Dale (wild) 17 ; Hereford (garden) 0-9 ; Birming- 

 ham 07. Mean 1. 

 H. pomatia. Banstead, Surrey 2-5. 



H. nemoralis. (a) roadside banks, Aldenham, three loci 0-2, 

 0-4, i-8 ; Hereford, two loci, i-i, 1-2 ; (b) beech wood, 

 Cranham 07; vars. rubella, libellula and castanea examined. 

 Mean 1. 

 H. hortensis. Roadside banks, Aldenham, three loci v. hitea 

 o*5, 0-3 ; v. incamata, trace, 0-3, 0.3 ; v. fasciata o*8 ; 

 Hereford, v. lutea 1-2 ; v. fasciata 1.6. Mean 0*6. 

 Ena montana. Beech woods, Hampden, Bucks. 103 ; Cranham, 

 Gloucester 77. Mean 90. 



1917 Jan. 1. 



