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. " lutescensJ^ 



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 sidcatulum and Rissoa lacteal 



p. 1. — Sph^riid^. 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^PvIUM coenefm. E. Siberia (Gerstfeldt). Yar. 

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

 C y das lacustr is oi'NihsoTi). C.^cwescms, MacgiUivray. 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. KivicoLA. Near Bath (Daniel). E. Russia 

 (jfelski) ; Denmark (Poulsen). 



P. 8. — S. OVALE. Wakefield (Lumb,Jide Harting). 



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

 well, Cambridgeshire (A. BeU). 



p. 20. — PisiDTUM AMNicuji. F. Forcst Bed, Norfolk (LyeU 

 and others). Syn. Cyclas iialustris, Drap., and C. ohliqua, 

 Lam. 



P. 20. — P. roNTiNALE. E. Algeria (Bourguignat). Yar. 

 Hensloiuana, F. Marine glacial deposit near Christiania 

 (Crosskey and Robertson). 



P. 23. — P. PusiLLUM. E. Greenland (Moller, as Cyclas 

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



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

 em range as in last. 



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



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

 Algeria (Bourguignat). 



P. 37. — XJ. MAEGARiTiPER. E. Amoorlaud (Schrenck) ; 

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

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



