Publication Dates of Parts in V.1 & 2:
1861: Parts 1-3 (V.1: 1-144)
1862: Parts 4-10 (V.1: 145-480)
1863: Parts 11-12 (V.1: 481-507; V.2: 1-64)
1866: Parts 13-15 (V.2: 65-206)
1867: Parts 16-19 (V.2: 209-400)
1868: Parts 20-23 (V.2: 401-536)
Britain in general
British Islands
Atlantic, North East (= warm + cold temperate (boreal))
Europe
Systematics, Taxonomy