sI'KCIKS OF PlStmrM. 33 



1^74. Pisidium pulcJielhtm, Jenyns : id. in Kiistt-r, Syst. Conch.-Cab. ix, 

 abth. 3, Cycladeen, p. 2-'>, pi. ii, f. }3-lo [wow Jenyns]. 



? Pisi'Ji-um hispunicum, Clessin : id., op. off. p. 37, pi. iv, f. 4-6, 



? Pisidium moreanum, Clessin : id,, o.p. cit. p. 38, pi. iv, f. 7-9. 



? Pisidium heldreichii, Clessin : id., op. cit. p. 38, pi. iv, f, 10-12, 



- Pisidium italicum. Clessin : id., op. eft, p. 40 pi. Iv, f. 16-18, [(Jf, 



specimens in Norman Coll., B.M. 98. 6. 20 : 22403 10.] 



Pisidium rivulare, Clessin: id., op. cit. p- 30, pi. iii, f. 7-11. 



[Specimens from the author in Norman Coll., B.M. 98.5.20: 

 22503-06.] 



1876. Pisidium sordelKanum [n. pp.] : Pini, Bull. Soe. Malac. Ital. ii, 



p. 18o. 



Pisidium nordensfcioldi, nov. sp. : Clessin in Westerlund, Xarh- 



richtsbl. Deutscb. Malakoz. (resell, viii, p. 103 ; id., }i. Sveusk. 

 Vet.-Akad. lli.ndl. n, xiv, No. 12, p. 68 [pi. f. 20]. 



- Pisidium sibiricum, nor. sp. : id., in Westerlund, Nachriphtsnl. 



Deutsch. Malakoz. Gesell. viii, p. 103 ; id., K. Svensk. Vet.-Akad. 

 Ilandl. n, xiv, No. 12, p. 69 [pi. f. 211 



Pisidium boreale, nov. sp. ; id., in Westerlurd, Nacbricbtsbl. 



Deut.ch. Malakoz. Gesell. viii, p. 103 ; id., K. Sveusk. Vet.-Akad. 

 Handl. n, xiv, No. 12, p. 70 [pi. f. 23]. 



1877. Pisidium henninii, Wehvitscli : id. in Kiister, Svst. ConcU.-Cb. 



ix, abth. 3, Cycladeen, p. 61, pi. vii, f, 12-14. 



Pisidium ovatum, n. sp. : id., op. cit. pi. viii, f. 22-24. [C/. speci- 



mens in Norman Coll., B.M. 98.5. 20: 22399-402,] 

 1880. Pisidium taryioniaws ['p] : Puulucci, Bull. 3oc. Jklalac. Ital. vi, 



p. 176. 

 1888. Pisidium lindxtroemi, n. sp. : Cle.^sin, O.'vers. K. Vet.-Aknd. H;ii}dl. 



Stockholm, 1888, p. .^40, fi-s. 

 1893 ? Pisidium arcticmn, n. sp. : tioti 1883, \Vestevlimd, Nacbrichtsbl. 



Deutsch. Malakoz. Gesell. 1893, p. 132. 



Pisidium niic/patum, n. sp. : Benoit in Locard, Coquil. Eaux dpuces 



France, p. 142. 

 1896. Pisidium impar, m. : \Vesterlund, Ann. Mus. Zool. Acad. lu^p. 



Sci. St. Petersb. 1896. p. 198. 

 1899. Pisidium xantfwlfnium, Castro in coll. : Locard, Arch. Mus. Ili.-t. 



Nat. Lvon, vii, No. 1, p. 209. 

 1902. Pisidium maculaturn, n. sp. | T-. , i >" i ux 1.1 T-> 



Pisidium trwnoidesj n. sp. [ Mowsk,, ^ a cbrlchtsbl I Deutsch. 



Malakoz. (iesell. xxxiv, pp. 94 & 95 ; Rossmassler, Icon., N. P. 

 x, f. 1807 & 1809, 



1909. Pisidium dubium, n. sp, : Lindholm in Korotneff, ^ issen ch. 

 Ergebn. Zool. Exped. BaikalrSee, iv, p. 85, pi. ii, f. 45, 46. 



The form has long passed on the Continent almost equally under 

 the names of P. easertanum and P. fontinale. What the original 

 of the last name was will now never be known for Lamarck's 

 diagnosis is far too brief, whilst the specimens that Draparnaud 

 associated with Lamarck's name have been lost, and his descriptions 

 are too vague and his figures too poor to permit of any definite 

 conjecture *. Fortunately there is no need to speculate further on 



* Locnrd suggests (99, p. 158) that, f, 11 & 12 of the text to pi. x ( = f. 12 

 & 13 of the plate) may belong to P. caserfanunt, Poli, whilst the other 

 figures can not be precisely defined. Personally 1 would doubtfully refer 

 nos. 8, 9, & 12 of the text ( = 9, 10, & 13 of " the plate) to the present 

 species. 



D 



