BIOLOGY. 33 



of Mytilus edulis ; Robertson (480). — Swimming powers of Lima ; Strick- 

 land (498).— Boring of Teredo, &c. ; Thompson {b\l).—Littorina rudis in 

 copulation with L. littoralis; Thompson (522). — Parasites of Mussels; 

 VoGT (529).— Effect of volume of water on Limncea ; Warington (536). — 

 Thread-spinning by freshwater shells ; Warington, (2) xiv, p. 366. — 

 Tenacity of life in snails ; Woodward (548, 555).— Habits of Pelecypods 

 in confinement ; Woodward (549). — Notes on the history of Conchology ; 

 Anon., Mag. Zool. Bot. ii, pp. 238-266. 



18. Economics. 



Pearl oyster of Ceylon ; Dallas (228). — Pearl fishei-y in Conway ; C. D. 

 (171).— Limpets as food in Ireland ; Patterson (455). — British freshwater 

 pearls; Eennie (478).— Conway pearl fishery; Wilson, Mag. Nat. Hist. 

 iii, p. 451 : also Murray, 1. c. 



14. Collecting, &c. 



Collecting land and freshwater shells ; Cooper, Mag. Nat. Hist. n. s. iii, 

 pp. 602 & 603. 



B.—DISTRIB UTION. 

 Geographical. 



NON-MARINE MOLLUSC A. [For Marine see p. 38.] 



Distribution of land and freshwater Molluscs ; Forbes (243). 

 Geographical distribution of Bulimi ; Reeve (472). 



a. Pal^arctic Zone. 



1. Septentrional Region. 



British Isles :— List of land and freshwater shells, with notes, and some 

 MS. names ; Alder (45). — Notes on some land and freshwater shells ; 

 Hincks, V, p. 367. — Notes on fauna, with additions ; Jeffreys (353, 354, 

 356).— Notes on Pisidium ; Jenyns (368).— Notes on land and freshwater 

 shells, especially near Preston ; Kenyon (381).— Classification of Mollusca; 

 Leach (392).— Naturalization of Dreissensia ; MooRE (438). — Radula of 

 land shells ; Thomson (525). 



England and Wales : — Cornwall : Occurrence of Helix revelata near 

 Falmouth; Benson (90). —Dorset : Occurrence oi Bulimus acutus; Gray 

 (305). — Hampshire: Occurrence of Helix pomatia and Clausilia rolpldi; 

 Hawker, (2) xvi, p. 212: ('. ro^^/m confirmed ; Woodward, t. c. p. 298.— 

 Somerset: Occurrence of Helix cantiana near Keynsham ; Lonsdale, 

 (2) xviii, p. 187. — Gloucester : Occurrence of Cla^mlia mortilleti at 

 Cheltenham ; Schmidt (483) : Confirmed ; Prentice (464).— Surrey : 

 Land and freshwater shells from Mickleham ; Cooper, Mag. Zool. Bot. ii, 

 p. 471 : Occurrence of Ph/sa acuta at Kew ; Norman (448) : Is an 

 introduction into Kew Gardens and not indigenous; Norman (449).— 

 London : Sphcerium pisidioides, n. sp. ; Gray (294) : Sphcerium pallidum, 

 n. sp. ; Gray (293): Occurrence of Limax soiverhyi; Denson (231): 

 Occurrence of Testacella scutidum; Blair (158).— Henley on Thames: 



