SPKCIKS OF PISID1CM. 



1874. Pisidium pulchellum, Jeiiyns : id. in K lister, Syst, Conch .-Cab, ix, 

 abth. 3, Cycladeen, p. 23, pi. ii, f. 13-15 [non Jeiiyns]. 



- ? Pisidium hispunicum, Clessiu : id., op. cit. p. 37, pi. iv, f, 4-6, 



- ? Pisidium moreanum, Clessin : tW,, op. 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, cit, p. 40 pi. iv, f. 16-18, \_(Jf. 



specimens in Norman Coll., B.M. 98. 5. 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: 

 22-503-06.] 



1876. Pisidium sordellicinum [n. sp.] : Pini, Bull. SQC. Malac, Ital. ii, 



p. 18o. 



- Pisidiitm nordenskioldi, nov. sp. : Clessin in Westerlund, Nach- 



richtsbl. Deutach. Malakoz. Gesell. viii, p. 103; id., K. Svensk. 

 Vet.-Akad. Handl. ii, xiv, No. 12, p. 68 [pi, f. 20]. 



- Pisidium sibiricum, no?, sp. : id., in Westerlund, NaohrichtsM. 



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, Nachrichtsbl. 



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

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



1877. Pisidium herminii, Welwitsch : id. in Kiister, Syst. Conc^.-Cab. 



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



Pisidium ovatt/m, n. sp. : id., op. cit. pi. viii, f, 22-24. \Cf, speci- 



mens in Norman Coll., B.M. 98. 5. i>0 : 22399-40^.] 

 1880. Pisidium tarywnianus [sic] : Paulucci, 43wll. Soc. ISIalac. Ital. vi, 



p. 170. 



", n. pp. : U 



Stockholm, 1888, p, 340, figs. 

 1893 ? Pisidium arcticum, n. sp. : turn 1883, Westerlund, Nachijchtsbl. 



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



- Pisidium nucleatum, n. sp. : Benoit in Locard, Coquil. Eaux douces 



France, p. 142. 

 1896. Pisidium t'mpar, in. ; Westerlund, Ann. Mus. Zool. AcatJ. Imp. 



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

 1899. Pisidium xanthoknum, Castro in coll. ; Locard, Arch. Mus, JIL-t. 



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



1902. Pisidium maculatu*,, n . sp, I D bowgki NacLric ht 8 bl. Deutsch. 

 Ptsidinm tnyonoides, n. sp. \ J 



Malakoz. Gesell. xxxiv, pp. 94 & 95 ; Kossmassler, Icon., N. F. 



x, f. 1 807 & 1809, 

 1909. Pisidium dubiuw, n. sp, : Lindholm in Korotneff, MMssensob. 



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



The form has long passed on the Continent almost equally under 

 the names of P, casertanum 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 



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

 & 13 of the plate) may belong to P. casertanum, 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 preseut 

 species. 



D 



