TAYLOR : DOMINANCY IN NATURE. 
17 
ill the same European region, and though now completely expelled 
therefrom, and to a large extent from Eastern Asia, where tlieir rear- 
most representatives, including the most modern and recently evolved 
genus Ganesella, mingle with the advancing Euadeniates in the 
country between India and Japan ; tlieir metropolis is, however, now 
situated in the islands of the Malay Archipelago and in northern 
Australia, the most archaic genera, Camwna, Obba, Hadra, etc., 
leading the advance and coming in competition with the rearmost of 
the Protogomi, the still more primitive group which preceded them. 
In the New World the Epiphallogona preceded the Euadenla 
over the Aleutian bridge, and passed southwards, followed by the 
Euadenla, by whom they are driven forwards, until at the present 
day the Epiphallogona occupy Central America, the Greater and 
Lesser Antilles, and Northern South America, often associated with 
the later evolved and competitive Eaadema, but extending beyond 
them in every direction, except on the north, the direction from which 
the newer and stronger race are advancing. 
Fig. 6.— Geographical distribution of the chief Helicidian families showing the areas they now 
occupy and — studied with Fig 5— the chronological succession of their evolution, the correlation 
of their phylogeny and geographical distribution, and also indicating approximately the probable 
evolutionary area and migratory paths by which their distribution has been attained. 
Yellow represents the areas to which the predominance of the Haplogona is now restricted ; 
Green, those dominated by the Protogona, who are encroaching upon the haplogonous area, and 
are themselves being slowly over-run by the Epiphallogona, who regions are coloured Blue ; 
the areas of the Belogona Euadenia are distinguished by Purple, their advanced guard mingling 
with the rear of the Epiphallogona, which they are gradually driving forward, while the Belogona 
siphonadenia (Red) are in turn invading and slowly expelling the Euadenia from the areas they 
now occupy. 
The Protogona are the most ancient and first evolved of the 
Helices, and are, therefore, the most distant from Europe, their true 
area of origin ; they possess the simplest genitalia, but are gradually 
and intimately linked with their improved successors. 
The Protogona weve evolved an immensity of time ago in or near the 
same region as their predecessors, and have been diffused over the 
world by approximately the same routes ; they are now completely 
B 
