THE ROMAN COMAGMATIC REGION. 
FIG. i. Sketch map of Italian comagmatic regions. 
Roman Region. 
Tuscan Region. 
Venetian Region. 
Apulian Region. 
V =Vulsinian District. 
Ci = Ciminian District. 
S =Sabatinian District. 
L =Latian District. 
H =Hernican District. 
A =Auruncan District. 
Ca=Campanian District. 
Ve=Vesbian Volcano. 
P =Phlegrean Fields. 
I =Ischia. 
i =Montecatini. 
2 = Campiglia. 
3 = Massa Marittima. 
4 =Roccastrada. 
5 = Monte Amiata. 
6 =Tolfa. 
7 =Cerveteri. 
B =Berican Hills. 
E =Euganean Hills. 
Vu= Monte Vulture. 
Et =Etna. 
