SPECIES OF PISTDIUif. Ill 



LINCOLNSHIRE, NORTH. LN. 



Louth (Burwell Wood) [0. S. C.]. ; Tetney Lock [C. S. C.]. 

 WESTMORLAND. WL. 



Patterdale [J. L.]. 



IRELAND. 



CORK, WEST. WC. 



Cooraerkane Valley [K. H. J.]. 

 GALWAY, SOUTH. SGr. 



Rea, L., in association with P. lilljeborgii [R. A. P.]. 



The continental distribution of P. steenbuchii as at present known 

 is certainly peculiar. Besides Greenland [Nat. Hist. Mus. Copen- 

 hagen, & Norman Coll., B.M. 98.5.20: 22507-11] and Iceland 

 [F. H. Sikes Coll.], it is known from Scandinavia [Lynge Coll. ; 

 Johansen Coll.; & Norman Coll., B.M. 98.5.20: 82166-69], 

 whilst specimens were collected by Dr. Scharff at Frankfort-on-the- 

 Maine [Conch. Soc. Coll.] and it has been received from R. Schtschut- 

 schja, Eastern Siberia, under the name P. costulatum, and from Lake 

 Baikal as P. korotnevi, Lindholm (95, p. 85). 



As a fossil it occurs in the Pleistocene of Denmark [Johansen 

 (85, p. 9)]. 



14. Pisidium lilljeborgii, Clessin. 



[Pis. II, f. 8 ; IV, f. 2 ; XXIII, f. 2 & 18 ; 

 XXVIII, f. 1, 9, 12, 13, 17-26.] 



1802. Pisidium nitidum, var. splendens, Baudon : Jeffreys (non Baudon) 

 Brit. Conch, i, p. 25. [Cf. specimens from type loc., Lerwick, in 

 Norman Coll., B.M. 1911.10.26: 7681-95.] 



1886. Pisidium lilljebori/ii, n. sp. : Clessin in Esmark & Hoyer, Malak. 

 Blatt, N.F. vii'i, p. 119. 



1889. Pisidium alpicola, Cless. [n. n.] : Clessiu in Suter, Malak. Blatt., 



N.F. xi, p. 191. [Cf. specimens from type Inc., Berglisee 

 (7,546 ft), in Norman Coll., B.M. 98. 5. 20 : 22440-43.] 



1890. Pisidiinn loveni, Clessin : Clessin, Moll. Oesterreich-Ungarns, 



p. 765 [for the preceding]. 



1909. Pisidium nordenskioldi, var. semenkevitschi, nov. : Lmdholm in 

 Korotneff, Wissensch. Ergebn. Zool. Exped. Baikal-See, iv, 

 p. 86, pi. ii, f. 49, 50. 



This exceedingly pretty and well-marked northern form, was 

 originally described (59, p. 119) as follows : 



"Muschel schief, sehr ungleichseitig, sehr aufgeblasen, 

 uhregelmassig stark gestreift, von gelblichcr Hornfarbe ; 



