100 CATALOGUE OF 



of Denmark [Johansen (85, p. 9)] ; in the Pleistocene (Campinien) 

 of Courtrai, Belgium [Mns. Hist. Nat. Brussels] ; and in the 

 Pleistocene (Mosbacher Sand) of Mauer (near Heidelberg) [Geyer 

 i69 ; p. 96)]. 



11. Pisidium supinum, A. Schmidt. 



[J'ls. IT, f. 5 ; IV, f. 7 ; XX V ; XXVI ; XXVII, f. 1 & 2.] 



18CO. Pisidium mpinum, n. sp. : Schmidt, Zeitschr. f. Malakozool. vii, 

 p. 119. 



1855. Pisidium jaudouinianum, nob. : Gassies, Actes Soc. Linn, Bordeaux, 



xx, p. 345, pi. ii, f. 2. 

 Pisidium kmnafou.rianwn,P. de Cess. : Cessae, Bull. Soe. Sci. Nat. 



LaCreuse, ii, p. 76. [For tig 1 , see Baudon, Mem. Soc. Acad. 



Oise, iii, 1857, pi. iv, f. 1.] 

 Pisidium hensloiviaimm, Sliepp. [pars'] : Malm, Gotheborgs K. 



Vet. & Vitt. Samh. Handl iii, p. 95. 



1856. Pisidium henslowianum, to. bonnafourianum and . jaudonianum : 



Moqu in-Tan don, Hist. Nat. Moil. France, ii, p. 681. 



1857. Pisidium conicum, nobis : Baudon, Mem. Soc. Acad. Oise, iii, 



p. 362, pi. v, figs. B, B, B, B. 



1858. Musculium supinum, Schmidt : Adams, Gen. Rec. Moll, ii, p. 45:?. 

 - Pisum supinum, Schmidt: id., torn. cit. p. 060. 



1866. ? Pisidium moitessieriauum [n. sp. ]: Paladilhe, Rev. et Mag. Zool. 

 xviii, p. 172. 



1870. Pisidium henslowanum, var. /3. mpinuni [tic], A. Schmidt : Kreg- 



linger, Syst. Verzeich. Deutsch. Biunen-Moll. p. 357. 



1871. Pisidium henslou-nnum, \ar. ^. iwrmah [sic]: Westerlund, Nova 



Acta R. Acad. Sci. Upsala, in. viii, no. 1, p. 158. 

 187 J . Pisidium baudonii, n. sp. : Clessin, Malakozool. Blatt. xx, p. 83, 



pi. iv, f. 1. 

 1890. Pisidium casertamim, vars. lonnafouxianum & jaudow'nfanum 



[sic]: Westerlund, Fauna palaarct. Region, vii, pp. 28 & 29. 

 1893. Pisidium Irigonum, n. sp. : Bourguignat in Locard, Coquil. Eaux 



donees France, p. 148. 

 1903. Pisidium supinoide*, n. sp. : Clessin in Futterer, Durch Asien, iii, 



p. 81. 



A very well-marked species, so that its quite recent recognition 

 in these Islands is remarkable. It was tirst pointed out by Dr. A. 

 C. Johansen, who in 1901 found dead specimens in the muddy 

 foreshore of the Thames at low-water near Kew Gardens. It w.'is 

 speedily detected first in the Lea Alluvium at Walthamstow (88, 

 p. 17 & 20) and then in most of the post-pliocene deposits of the 

 London district. Later a specimen that had been taken alive at 

 Buttersea was found in Dr. J. E. Gray's collection at the Natural 

 History Museum (1906. 6.18: 6-9) on a tablet with examples of 

 P. ollusale (1906. 6. 18 : 1-4) and labelled " Peru gibba " ; but it 

 was not until 1909, when specimens that had been taken by Mr. J. 

 E. Cooper in the Thames at Twickenham and Hampton Wick were 

 identified (44, p. 231), that it was definitely added to the British 

 Fauna. 



