SPECIES OF PISIDIOr. Ill 



LINCOLNSHIRE, XORTH. LN. 



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



W KSTMORLAND. WL. 



Patterdale [J. L.J. 



IRELAND. 



CORK, WEST. WC. 



Coomerkane Valley [K. H. J.]. 

 GALWAT, SOUTH. SG. 



Itea, 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.; & Xorman Coll., B.M. 98.5.20: 82166-69J, 

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

 Miiine [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.] 



2. Finiilium nitidum, var. splendent, Baud on : Jeffreys (non Baudon) 

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

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



1880. Pisidium lilljebot'<iii, n. sp. : Clessin in Esmark & Hoyer, Malak. 

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



1889. Pisidium alpicola, Cless. [n. n.] : Clessin in Suter, Malak. Bliitt., 



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

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



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



p. 765 [for the preceding]. 



1909. Pisidium nordenskioldi, var. temenkevifachi. nov. : Lindholm in 

 KorotnefT, 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 : 



"Husehel schief, sehr ungleichseitig, sehr aufgeblasen, 

 unrcgelmiissig stark gestreift, von gclblichcr Hornfarbe ; 



