Plate H- 
Fig. 1. 
Fig. 2. 
fig.. 5. 
Fig 'P. 
fig 5- Fi/g. 7. FUj. 73. 
Pri ncipal Phases of Colouring in. MoUiisca.Ftgs 1 -7 ami 11. 
Typical, hg. 1 . Heltx virgota. Da Costa x 2, Lewes, collected, hy MIT.S. Hillman . 
Melanism. Fig. 2. H.virgatav.nigrescen.s Crat.x 2,AftonDowrisJ.ofWight.collected by.Mrc.Ashfurd.. 
Melanoc hroism. H.virgatay. raMo-^ortaia Taylor x 2. laugharne. collected bv Mr G.W. Mellons. 
Leucochroism Fig F. H.virgatay. albicans Gratx 2, Newquay, collected by M.rX/i. James. 
Albinism. Fig 5. Hvlrgatn.v. nlba Taylor x 2.Lewes. collected by MT C.H.Morris. 
Erythrism. Fig. 6. Arion alyr v. izifat Lj. Minden.Germany, collected by HMichardson . 
Erythrochroism Fig. 7. Helix nenwmlis v. rubella Pirard. KnoUingley. coTlecbed by .J.Cordnkes. 
Xanthism. Fig. 11. Hnemamlis v. libellula (Hissoj.WinsUr collected by Rev.H.Milnes. 
Type s of Colourinc! in. Thermal Zbrurs. Figs 8-IZ. 
Polychromatism i Fig 8 . Lirpms virgineiis (LjWcstIndie.s\ 
(orTropical coloxirtjiQ^ ftg.9. ITelix pictd. Born,. Cuba ^FirE.Cotliers collection. 
OligoCHROmatism I Fig. 10. Helix pisana MillLMendme. collected by MVR . D . DarbUhire . 
lorTmpemie .■cionrinrjF Fin. 11. Hnemamlis y. libellula (Risso)WinsUr' collected by Rev.H.Milnes. 
Monochromatism l Fig.12. Vitnnapellaciitnv.depressiusciila .JefTcx S.colLhy MrKD.Marquand 
ror Boreal cotounnqj J Fig. 15. Ytritgo dlpestris Aider x 8. Cottingley. YorLs 
Fig. 6. 
Fig 11. 
Fig. 12. 
Fig. 9. 
Fig. 10. 
J W. Taylor^ del. 
Taylor Bros, Lut. Leeds, 
