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^BIID^E. 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. SPHJERITTM COENETJM. E. Siberia (Gerstfeldt). Yar. 

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

 Cydas lacustris of Nilsson). C.flavescens, Macgillivray. Var. 

 pisidioides. A form approaching this variety has been taken 

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

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

 the lower tube divided or forked. 



P. 7. S. RIVICOLA. Near Bath (Daniel). E. Eussia 

 (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 AMNICUM. F. Forest Bed, Norfolk (Lyell 

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

 Lam. 



p. 20. P. FONTINALE. E. Algeria (Bourguignat). Var. 

 Henslowana. F. Marine glacial deposit near Christiania 

 (Crosskey and Eobertson). 



P. 23. P. PTJSILLUM. E. Greenland (Moller, as Cydas 

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



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

 ern range as in last. 



P. 32. UNIO TUMIDUS. E. Eussia (Jelski). 



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

 Algeria (Bourguignat). 



P. 37. II. MAEGARITIFER. E. Amoorland (Schrenck) ; 

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

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



