SPECIKS OP pisinitnr. 1 



III. LIST OF INDETERMINATE PAL^EARCTIC FORMS. 



The following named species have not been dealt with in this 

 paper or relegated to synonymy, either because of the inadequate 

 descriptions given of them and the absence of the actual or 

 authenticated specimens on which to form an opinion concerning 

 them, or for other specified reasons : 



Pisidium acututn, m. : L. Pfeiffer, Arch. f. Naturg. vii, 1841, Bd. i, 

 p. 230. 



Forbes and Hanley (63, vol. ii, p. 131 ) refer this to P. hensloic- 

 anum, and other writers have copied from them, but it is hard 

 to see the reason, especially when the author notes that it 

 seems more nearly allied to P. obliqunm \_=amnicuni] than to 

 P. font-indie. 



Pisidium aspen', Cless. : Clessin in Suter, Malako/. Blatt., N. F. xi, 

 1889, p. 26. Zugersee, 200 in. Not afterwards referred to. 



: P. milium, var. asperi, Cless. : Clessin in Suter, Malakoz. 



Blatt., N. F. xi, 1889, p. 25 ; Clessin, Moll.-Fauna Oesterrtich- 

 Ungarns, 1890, p. 786, fig. Klb'usee, 27 m. 



Whether the author considered this and the preceding species 

 to be identical or not does not appear. 



Pisidium barbuzanum, Castro in coll.: Locard, Arch. Mus. Hist. 

 Nat. Lyon, vii, no. 1, p. 210. 



This may be a dwarfed P. casertanum, or P. nitidum. 



Pisidium caariense, Shuttl. : Shuttleworth, Mitthl. Naturf. Gesell. 

 Bern, 1852, p. 146. 



Pisidium charpentieri, m. ; Clessin, Moll,-Fauna Oesterreic h- 

 Ungarns, 1890, p. 787, fig. 



Pisidium colbeaui, Clessin : Clessin in Ku'ster, Syst. Conch. -Cub. ix, 

 Abth. 3, Cycladeen, p. 48, 1874, pi. v, f. 21-23. 



Pisidium conventus, n. sp. ; Clessin, Malakoz. Blatt. 1877, p. 181. 

 May be P. nitidum. 



Pisidium creplini, Dkr. : Deshayes, Cat. Conch. Brit. Mus. ii, p. 280. 

 Is a Sphcerium. 



Pisidium dabneyi, nov. sp. : Guerne, Le Nat. ix, 1887, Ser. 11, p. 19o. 

 Is probably a Sph&rium. 



Pisidium ddint/oli, Bivona: Villa, Disp. Syst. Conch. 1841, p. 44. 

 Is a Sphcerium. 



Pisidium demissum, m. : Clessin, Correspond.-Bl. zool.-min. Yer. 

 Regensburg, xxviii, 1874, pr 182. 



Pisidium diibrueili, nob. : Baudon, Rev. Sci. Nat. i, 1872, p. "0, 

 pi. iii, f. 1-4. 



Pisidium duplication, m. : L. Pfeiffer, Arch. f. Naturg. vii, 1841, 

 Bd. i, p. 230. 



Morch (119, p. 336) and Kreglinger (91, p. 362) mnlce 

 this a syriomm for P. nitidum. It was overlooked hy Forbes 

 and Hnnley, although its description follows that of P. amtinn. 

 Pfeiffer says that the species seems to be related to the Cydas 

 appcndicultita, Turt., with which he was unacquainted. 



Cyclas fontinalis : Uraparnaud, Tabl. Moll. France, 1801, p. 105. 

 Probably in part P. casertunum (see pp. 6 & 33). 



