150 SUPPLEMENT. 



P. xxxix, 1. 14 from bottom, after "chalk" add " and gneiss." 



P. xlii, 1. 3 from top, for " marble " r. " bronze." 



P. Ixxxii, last 1., for " ebenus" r. " lutescens." 



P. cii, 1. 6 from top, for "Lilljeborg" r. "Loven"; and 1. 

 7, for " Denmark" r. " Sweden." 



P. cxi, 1. 10 from bottom, for " nodiferus" r. "nodifer"; 

 and add " Lepton sulcatulum and Rissoa lactea" 



P. 1. — Sph^kiid^:. The cylinder is placed at the shorter 

 end, and not on the same side as the ligament — this being 

 contrary to the usual position of the tubes in the Conchifera. 



P. 5. — Sph^rium cornettm. E. Siberia (Gerstfeldt). Var. 

 Scaldiaiw,. Many places. E. Wisby, Sweden (Lindstrom, as 

 Cyclas lacustris of Nilsson). C.Jhwescens, Macgillivray. Yar. 

 pisidioides. A form approaching this variety has been taken 

 by Mr. Jordan near Bath, and by Mr. Nelson near Birming- 

 ham. Mr. Rich found a monstrosity of the variety, having 

 the lower tube divided or forked. 



P. 7. — S. rivicola. Near Bath (Daniel). E. Russia 

 (Jelski) ; Denmark (Poulsen). 



P. 8. — S. ovale. Wakefield (Lumb,fide Harting). 



P. 10. — S. lactjstre. Near Glasgow (Purdie). F. Barn- 

 well, Cambridgeshire (A. Bell). 



P. 20. — Pisidium amntcum. F. Forest Bed, Norfolk (Lyell 

 and others). Syn. Cyclas palustris, Drap., and C. obliqua, 

 Lam. 



p. 20. — P. fontinale. E. Algeria (Bourguignat). Var. 

 Henslowana. F. Marine glacial deposit near Christiania 

 (Crosskey and Robertson). 



p. 23. — P. ptjsilltjm. E. Greenland (Moller, as Cyclas 

 SteenbucJiii); Sicily (Benoit); Algeria (Bourguignat). 



p. 25.— P. nitidtjm. F. Forest Bed (A. Bell). E. South- 

 ern range as in last. 



P. 32. — Unio tumidtjs. E. Russia (Jelski). 

 P. 34. — U. pictorum. E. Siberia (Gerstfeldt and others); 

 Algeria (Bourguignat). 



P. 37. — U. MAPvGARiTiFER. E. Amoorland (Schrenck) ; 

 Spain (Graells) ; probably also North -American, as Alasmo- 

 donta arcuata of Barnes. A modern concordance of the Mol- 



