PISIDTUM 327 



1873. Pisidinm scholtzii, n. sp. : Clessix, Malak. BUitt., xx, 



p. 23, pi. i, f. 1. 

 1873. Pisidium (Fossarina) scholtzi, Clessin : Clessix, in 



Westerlund, Fauna Moll. Svecioe, pt. ii, p. 540. 

 1873. Pisidium (Fossarina) ohtusale, C. Pfeiffer : Clessix, t. c, 



p. 547. 

 ?1902. Pisidium raddei, n. sp. : Dybowski, NachrichtsU. 



Deutsch. Malak. GeselL, xxxiv, p. 95; 



Rossmassler, Icon., N.F. x, f. 1810. 

 1903. Corneocyclas (Cyclocalyx) scholtzii, Cless. : Dall, Proc. 



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

 1921. Pisidium obtusalastrum : B. B. Woodward, Proc. 



Malac. Soc. Lond., xiv, p. 220. 



First recorded as British in 1832, by L. Jenyns, as P. 



ohtusale, Pfr. [See ref. above.) 

 British Distribution in Time : Pleistocene to Recent. 



18. ?Pisidlum conventus, Clessin. 



Etym. : — So named because described by its author at the 

 Meeting (Convention) of the " Dredge-Ausfluges der 

 Zoolog. Section der 50. Naturf.-Versamml. zu Miinich." 



[To this species Dr. N. H. Odhner has referred on ana- 

 tomical grounds some British specimens which, how- 

 ever, C. Oldham and other British authorities would 

 refer on conchological grounds to one or other of 

 the better-known British species. Odhner considers 

 the following to be identical. {Cf. Odhner, Arch. f. 

 Mollkunde, 1923, pp. 26-42.)] 



1876. Pisidium occupatum, n. sp. [pars] : Clessix, Bull. Soc. 



Vavdoise Sci. Nat., xiv, p. 237, pi. iii, f. 4. 



1877. Pisidium Conventus, n. sp. : Clessix, Malk. Bldtt., 



xxiv, p. 181, pi. iii, f. 5. 

 1880. Pisidium quadrangulum, Clessin : Clessin, in Suter, 



Zool. Anz., iii, p. 207. [Norn. nud.'\ 

 1880. Pisidium fragillimum, Clessin : Clessix, t. c, p. 208. 



[Nam. mid.] 

 1880. Pisidium asperi, Clessin : Clessix, t. c, p. 208. [Norn. 



nud.] 

 1880. Pisidium prolongatum, Clessin : Clessix, t. c, p. 208. 



[lYom. nud. Nan Clessin, 1877.] 



1889. Pisidium asperi, Cless. : Clessix, in Suter, Malak. 



Blatt., N.F. xi, p. 26. 



1890. Pisidium fragillimum, Clessin : Clessix", Moll. Fauna 



Oesterr.-Ung., p. 780, f. 514. 

 1890. Pisidium quadrangulum, Clessin : Clessix', o. c, p. 781, 



f. 515. 

 1890. Pisidium Studeri, Clessin : Clessix, o. c, p. 782, f. 516. 



[Nom, nov, for Pv asperi of 1880 & ?1889.] 



