3U8 SPaERIID^ 



Genus : 2. PISIDIUM, C. PfeifEer.i 



Etyiii. : — Lat. pisum, a pea. 



Type : — Tellina amnica, Miiller. 



{TcUina, Sphariimi, Cardium, Cyclas, vett. auctt.) 



1821. Pisidium : C. Pfeiffer, Naturg. Deutsch. Moll., i, 



pp. 17 & 123. 

 1832. Pern, Leach MSS. : Jenyns, Trans. Camb. Phil. Soc, 



iv, p. 301, in synon. 

 1832. Euglesa, Leach MSS. : Jenyns, t. c, p. 302, in synon. 

 1840. Galilcja : 0. G. Costa, Fauna Sicilia, Molluschi, p. 1, 



pi. i, f. 2 a, A, B. 

 1845. Pindium [? err. typ.] : Humphreys, Contrih. Fauna & 



Flora Cork, Invertebrala, p. 7. 



'--,Q.(.'^\-Piscidium : Brown, Illust. Foss. Conch. Brit., p. 209. 



1847. Pisum, " Megcrle, 1811; not Linn." : Gray, Proc. Zool. 



Soc. Loud., XV, p. 184. [Non Megerle.] 

 1852. Euglesa : Leach, 31oll. Brit. Si/iio])., p. 291. 

 1852. Peru : Leach, o. c, p. 291. 

 1852. Cordula : Leach, o. c, p. 292. 

 1857. Musculiuni, Link : H. & A. Adams, Genera Moll., ii, 



p. 451. \Non Link. Altered on p. 660, 



1858, to " Pisum, Miihlfeldt." Non Megerle 



von Miihlfeldt.] 

 1871. Cycladina, a group of Pisidium : Clessin, Malak. Bldtt., 



xviii, p. 189. [Non Latreille, 1825; nee 



Cantraine, 1835.] 

 1873. Fluminina, Sect. 1 of Pisidium : Clessin, in Wester- 



lund. Fauna Moll. Svecice, pt. ii, p. 529. 

 1873. Rivulina, Sect. 2 of Pisidium : Clessin, o. c, p. 532. 



[Non Lea, 1851 (Tiaridfe).] 

 1873. Fossarina, Sect. 3 of Pisidium : Clessin, o. c, p. 535. 



[Non Adams & Angas, 1863.] 

 1903. Corneocyclas, Ferussac, 1818 (restricted) : Dall, Proc. 



Biol. Soc. Washington, xvi, p. 7. [Non 



Ferussac] 

 1903. Cyclocalyx, sect, of Corneocyclas, Dall : Dall, I. c. 

 1921. Neopisidium, ) subdivisions of Pisidium : Odhner, 

 Eupisidium, J Journ. of Conch., xvi,]). 222. 



[Much of the synonymy of this puzzling group is and 

 must be " paper " work : the correctness or other- 

 wise of the various determinations of different 

 authors cannot now in most instances be checked.] 



* For nomenclature, etc., Sec Woodward, Catalogue of the British species 

 of " Pisidium" . . . in llie . . . Brili-:h Museum, I'.Wi ; also Proc M aloe. 

 Soc. Lond; xiv, l'J21, p. 209; and xvi, 1924, p. 14. Sec also Stelfox, 

 Journ. of Conch., xv, 1918, p. 28'J. 



