SPECIES OF PISIDIUM. 119 



RECENT. 



CORK, WEST. WC. 



L. Namaddra and small uunained tarn close thereto [A. W. S.]. 

 GAL WAY, WEST. WG. 



InishboBn (L. Gowlanagower) [A. W. S.]. 

 GAL WAT, SOUTH. SG. 



TwUanafrankagh, L. [R. A. P.]. 

 KEKRV, SOUTH. SK. 



L. Nagarriva [D. M.] [K. H. J.] [A. W. S.] [R. A. P.J. 



Quite recently Dr. Nils Hj. Odher, of the Riksmuseurn at 

 Stockholm, very kindly forwarded specimens from the Takern See, 

 Ostergotland, Sweden, among which this species occurred ia 

 abundance. They were found in Chara at a depth of about 1 m. 

 with P. subtruncaium, P. casertanum, P. nitidum, P. milium and 

 P. lilljehorgii. The species is, therefore, a northern one and should 

 now be sought for in tarns in the Western Highlands of Scotland. 



16. Pisidium obtusale (Lam.?) Jenyns. 

 [Pis. II, f. 10; IV, f. 4; XXX.J 



1818. ?Cyc.las obtusalis: Lamarck, Hist. Anim. sans Vert, v, p. 559 



(id., 2nd ed., vi, 183"), p. 269). 

 1821. Pisidium obtusale, Lam. ? : Pfeiffer, Xaturg. Deutsch. Moll, i, 



p. 125, pi. v, f. 21, 22. 

 1832. Pisidium obtusale, Pi'eiff. : Jenyns, Trans. Camb. Phil. Soc. iv, 



p. 301, pi. xx, f. 1-3. 

 1837. Pisidium fontinale, var. obtusale, mihi : Held, Isis, 1837, col. 



306. 

 1843. Ct/cfas fimtinalis, var. B. obtutalis: Dupuy, Essai Moll. Gers, p. 89. 



- Cyclcis obtu-salis, Lam. ; Hanley, Cat. Rec. Bivalve Shells, p. 90. 

 1852. Per a giliba : Leach, Moll. Brit. Synop. p. 292. 

 1854. Pisuin obtusale, Lamk. : Deshuve?, Cat. Conch. Brit. Mus. ii, 



p. 279. 

 18oo. Pisidium ylobulosum, nob. : Gassies, Actes Soc. Linn. Bordeaux, 



xx, p. 348, pi. ii, f. 8. 



1857. Pisidium casertanum, var. G. qlobulosum, Gass. : Baudou, Me"m. 



Soc. Acad. Oise, iii, p. 343 & 348. 



1858. Musculium obtusale, Pfeitf. : Adams, Gen. Rec. Moll, ii, p. 452. 



1859. Pisidhim pusillum, var. obtusalis: Jeffreys, Auu. & Mag. Nat. Hist. 



in, iii, p. 37. 



1862. Pisidium tiitidum, Jenyns (pnrs) : Jeffreys, Brit. Concli. i, p. 25. 

 1873. Pisidium scholtzii, n. sp. : Clessin, Malakozool. Blatt. xx, p. 23, 



pi. i, f. 1. 



1902. ? Pisidium raddei, n. sp. : Dybowski, Nachriehtsbl. Deutsch. 



Malakoz. Gesell. xxxiv, p. 95; Rossmassler, Icon., N. F. x, 

 f. 1810. 



1903. Corneocyclas (Ot/cloca/y.r) scholtzii, Cless. : Dall, Proc. Biol. Soc. 



Washington, xvi, p. 7. 



The recognition of this very distinct form must be attributed to 

 Jenyns, for though he like Pfeiffer adopted Lamarck's name, there 

 is no evidence as to the true nature of the forms those two older 



