SPECIES OF PTSIDIL'M. 15 



Pisidium prqfundum, n. sp. ; Clessin, Bull. Soc. Vaud. Sci. Nat., 

 Ser. n, xiv, p. 239, pi. iii, f. 5. 



May be either P. nitidum or P. personatuin. 



Piitidiinn prolongation, n. sp. : Clessin, Malakoz. Blatt. 1877, p. 180, 

 pi. iii, f. 6. 



Said to be near P. occupation. May be P. nitidum or P. sub- 

 tntncatum. 



prolonyatum, Clessin: Clessin in Suter, Zool. Anz. iii, 



1880, p. 208 [n. n.] ; Clessiu, Moll.-Fauna Oesterreich-Ungarns, 

 1*1)0, p. 78">, tig. 



An obviously different species to the preceding. 



Pisidium qnadrangulum, Clessin ; Clessin, Moll.-Fauna Oesterreich- 

 rngarns, 1890, p. 781, fig. 



Pisidium rambottianum, nov. sp. : Adami, Bull. Soc. Malac. Ital. vii, 



1881, p. 200. 



The author says it has some affinity with " subtruncalum, 

 Jen." ! 



reclusianum, nobis : Bourguignat, Journ. de Conch, iii, 

 1852, p. 174, pi. viii, f. 8 a-d. 



Jeffreys (Ann. & Mag. Nat. Hist., Ser. in, iii, 1859, p. 39) 

 refers this to " young specimens of P. henxlomanum (var. pul- 

 chellwn}" but it is too flat and not round enough. More 

 probably it is fry of P. amnicum. 



Pisidium reclvzianum, Bourg. : Baudon, Mem. Soc. A cad. Oise, 

 Beauvais, iii, 1857, p. 53 [non Bourg.]. 



Jeffreys (Ann. & Mag. Nat. Hist., Ser. in, iii, 1859, p. 38) 

 determined this to be Turtonia minuta, to which Baudon 

 assented (Journ. de Conchyl. viii, 1860, p. 179). 



Pisidium rotundtim, P. de Cess. : Cessac, Bull. Soc. Sci. Nat. Creuse, 

 , ii, 1855, pp. 73-77. 



An abnormality. 



Pisidium schmidti, n. pp. : Clessin, Nachrichtsbl. Deutsch. Malakoz. 

 Gesell. xxxix, 1907, p. 8. 



Pisidium sinuatum, Bourg. : Bourguignat in Petit de La Saussaye, 

 Journ. de Conch, ii, 1851, p. 421 note ; id., op. cit. iii, 1852, p. 49 ; 

 pi. i, f. 6-10. [Figure suggests fractured P. amm'cuin.l 



Baudon (Journ. de Conch, iv, 1853, pp. 277-279) refers it to 

 P. casertanum. 



Pif.idium studeri, Clessin : Clessin, Moll.-Fauua Oesterreich- 

 Ungarns, 1890, p. 782, tig. 



Pisidium submersum, n. sp. : Clessin, Malakoz. Blatt 1877, p. 179, 

 pL iii, f. 6. 



May be P. subtruncatum. 



Pisidium tritonis, Clesain : Clessin, Moll.-Fauna Oesterreich- 

 Ungarns, 1890, p. 783, fig. 



Pisidium urinator, n. sp. : Clessin, Bull. Soc. Vaud. Sci. Nat., Ser. n, 

 xiv, p. 236, pi. iii, f. 3. 

 May be P. pusillum. 



Pisidium watsoni, Paiva : Baron de Paiva, Journ. de Conchyl. xiv, 

 1866, p. 340, pi. xi, f. 3. 



Probably P. casertanum. 



