392 
PEOCEEDINGS OF TIIE SCIENTIFIC ASSOCCATroN7- 
Succinea approximans Shuttl. 
Cyclophorus amethystinus Guppy 
Helicina epistilia Guppy 
- — humilis Guppy 
— r volutin a Guppy 
— rhodostoma Gray 
Helicina conuloides Guppy 
— plicatula Pf. 
Neritina punctulata Lavi. 
Explanation of the Diagrams. 
In the upper figure of the first diagram 1 refers to a 
row of volcanic cones ; 2 is Morne Bruce ; 3 the Town of 
Boseau ; 4 Horne Daniel. The second figure is a section 
near Roseau ; a represents the newer volcanic accumula- 
tions ; b the coral formation ; b2 the conglomerate ; c the 
older volcanic formations. The third figure is a sketch of 
Dominica from the south, to show the hilly character of 
the Island. The fourth figure is intended to exhibit the 
dip of the beds of volcanic matter 'in the Souffriere at St. 
Vincent. The fifth figure illustrates the theory of the rela- 
tions of the formations of Dominica as given in the preced- 
ing paper ; /. being the former sea level (that is, the ex- 
treme extent of the subsidence [which took place probably 
during the miocene volcanic period) ; p the present sea 
level. The other letters a , b, c, have the same meaning as 
in the second figure, explained above. 
The second diagram gives sketches of tho remarkable 
Pitons of St. Lucia from three different points of view. 
