316 SPHJERlIDiE 



1874. Pisidiuni demissum, m. : Clessin, Correspond.-BldU. 



zool.-min. Ver. Regensbnrg, xxviii, p. 182. 



[Teste Odhner.] 

 187-1. Pisidiuni sphceriiforme, n. sp. : Clessin, in Fedchenko, 

 » Izvyest. imp. Obshchest. Lyulnt. Estestvoz. 



Antrop. I Etnogr. Moskva, xi, vuip. 1, p. 38, 



pi. iii, f. 33. 

 1909. Pisidiuni granuni, n. sp. : Lindholm, in Korotneff, 



Wissensch. Ergehn. Zool. Exped. Baikal-See, 



iv, p. 87. 



First recorded as British in 1832, by L. Jenyns. {See 



ref. above.) 

 British Distrilnition in Time : Cronierian to Recent. 



5. Pisidium personatum, Malm. 



Etym. : — Lat. personatus, masked. 



1831. Cydas gihha (Leach MS.) : Alder, Trans. Nat. Hist. Soc. 

 NorthumberU., i, p. 70. [Specimens from 

 Alder under this name in the Jenyns Collec- 

 tion belong {Fide C. Oldham, Stelfox in 

 litt.) to this species. Their identity, how- 

 ever, has not been fully established, and 

 since Leach's species was a mixed one the 

 name cannot be adopted. Alder himself 

 altered it to : — ] 



1838. Pisidium, pusilhmi, Jen. : Alder, o. c, ii, p. 341. 



Pisidiuni limosum (Nob.) [pars] : Gassies, Tabl. Moll. 

 Agenais, p. 206, pi. ii, f. 10. [Teste Stelfox, 

 from specimens in the Gassies' Collection 

 {Proc. Malac. Soc, xv, 1922, p. 55). There 

 is no proof, however, that these specimens 

 are identical with those originally described. 

 Dupuy's P. (jassiesianum {Cat. Extramar. 

 Gallia, Test., Feb. 1849 [p. 4], no. 232; Hist. 

 Moll. France, 1852, p. 685, pi. xxx, f. 7), 

 said by its author to be synonymous with 

 with Gassies' P. limosum, does not resemble 

 the present species so much as it does P. 

 i milium,. Held, with which it is still placed.] 



1855. Pisidium, personatum,, n. sp. : Malm, Gothehorgs K. Vet. 



& Vitt. Samhdll. Handl, iii, p. 107, figs. 

 ?1856. Pisidium, nitiduni, var. splendens (Baudon MS.) : Moquin- 

 Tandon, Hist. Moll. France, ii, p. 586. 

 (Baudon, Mem. Soc. Acad. Oise, iii, 1857, 

 pp. 335, 337, pi. i, f. B, B.) 



1873. Pisidium, {Fossarina) obtusale y personatum. Malm : 

 Clessin, in Westerlund, Fauna Moll. Svecice, 

 pt. ii. p. 548. 



?1849, 

 Mar. 



