88 PROCEEDINGS OF THE 



Mediterranean Elements (Maj) 3). — Here again the inset map 

 speaks for itself. The Mediterranean element is, as is evideiit 

 from the main map, mucli more restricted than the Atlantic (.«ee 

 map 2). There is still the maximum belt in the Channel zone; 

 but it extends nowhere beyond it. Towards the north it gives out 

 rapidly in the east and also in the west ; in Ireland the percentage 

 rises to the 25-39 per cent, level only in the extreme south-west 

 and sontli-east. The whole of the interior of Ireland and almost 

 the whole of Scotland are below the 12 per cent, share, and con- 

 sequently appear as bhinks in the map. The ])redominance of the 

 Mediterraneans (54-2 per cent.) over the Atlantics in the British 

 Isles and their inferiority in Ireland (44-75 per cent., or. if the 

 littorals are eliminated, 39 per cent.) is implied in the analysis of 

 the Atlantic element given above. 



Interlacing of the Atlantic and Mediterranean Elements. — This 

 problem does not lend itself to cartographic illustration without 

 the addition of a considerable number of maps. As this is out of 

 question, I may be permitted to reprint some of my observations 

 on pp. 521-524 of my original paper. 



(p. 521) "Seven of the littorals are generally diffused along the 

 coast of Great Britain and Ireland. Of these three az*e Atlantic 

 and four IMediterranean, whilst one of each class is absent in 

 Ireland, although widely distributed in Great Britnin. They are 

 Limonium vidgare and Atropis ruj^estris." 



(pp. 522-524 ; the following observations deal exclusively with 

 " translittorals," called " nou-littorals " in the original paper.) 



" Generally distributed through both islands, or the greater part 

 of both, are Hypericum Anclroscemum, Ilex Aquifolium, Ulex 

 eurojJcn'.s, Apiiim nodijiorum, Conopodium majus, Oenanthe crocafa, 

 CardvMS p)y'^'>^0C''i)lKdux^ Erica TetraVnv, E. cinerea, Scil/a non- 

 scrijdff, and, general in Great Britain but much restricted in 

 Ireland, Cori/dalis clavicalata. This means that the Atlantic 

 element i*' very prominent among the most, widely diffused of the 

 southern species, and its predominance appears still more marked 

 if we take into consideration that the general ])resence of the 

 Mediterranean Apitim nodiflorum and Cardims pijcnocepliahis is 

 probably due to their great facilities for extending their area, the 

 former as an aquatic, the latter as a waste land ])lant. The absence 

 in Ireland of a plant very widely spread in Great Britain, Genista 

 anglica, an Atlantic species, is very remarkable, and to it might 

 be added Tamvs communis, so common in England and yet doubt- 

 ful as a native in Ireland. On the othei- iiand, widely distributed 

 in England and Ireland are Lepidium heteropln/llum, Hypericum 

 elodes, Ulex Gallii. Cotyledon Umbilicus and JSednrn anglicum, all 

 but one Atlantic members of the Southern element. Another 

 group of species of fairly \\ide distribution is worth noting on 

 account of the fact that they are absent from the greater part of 

 the eastern counties of England, but extend through North 

 England and Scotland to the north-east coast. They are Vicia 

 Orohus, Saxifraga hypnoicles, Scilla verna, Bymenoj^hyllum tun- 



