378 TRANSACTIONS OF THE CANADIAN INSTITUTE. [VoL. VIII- 
from Bahia de Neiba to Sanmark Channel to the north of Gonave 
Island. These depressions are no doubt prolonged under water and 
extend to the east and south along the line of the Antilles, their sup- 
posed course being indicated on my map by broken lines. I suppose 
the line of depression I have indicated as crossing the north-eastern 
portion of the Island of Haiti to be a continuation of the dislocation 
which marks the separation of the two groups of the Antilles I have 
already mentioned. 
A depression strongly resembling that just referred to in the Island 
of Haiti occurs in the northern part of Venezuela. One part of this 
depression is indicated by the Gulf of Cumana or Cariaco, and it 
probably extends on the east to the Gulf of Paria, where it joins or 
forms a continuation of the great dislocation indicated in my paper on 
the “ Growth of Trinidad” (Trans. Can. Inst., 1905, page 137), which I 
have there shown, and also in my paper in the Geological Magazine 
(1900, page 322), toextend northward between the Islands of Tobago and 
Barbados on the east, and Grenada S. Vincent, &c., on the west ; and 
thus in fact to be a continuation of the line of dislocation separating the 
inner group of the Antilles from the outer group, which line crosses the 
north-eastern part of Haiti as already stated. The area about 
Cumana (see Wall’s Map of Venezuela, Journ. Geol. Soc., Lond., Vol. 
XVI, 1860, page 470) includes tertiary as well as cretaceous rocks. Many 
of the tertiary fossils from Cumana described by me in the Journal of 
the Geological Society of London (1866 Vol. XXII, page 579) are of the 
’ samespecies as those foundat Lavega in Haiti, and the geological resem- 
blance between the two localities isremarkable. I supposethis line of dislo- 
cation, which I have thus traced from Haiti through the north-eastern 
Antilles across Guadelupe and between Barbados and Tobago on one 
hand, and St. Vincent and Grenada on the other, to the Bocagrande and 
Gulf of Paria and thence to Cumana, extends westward to Caracas and 
possibly thence to the Lake of Valencia, which is situated in a part of 
the same depression. 
There is, I think, a fair amount of evidence for the existence of the 
line of depression or dislocation I have described. But that for the 
inner line is less clear, and its course must be regarded as more 
hypothetical. This is owing to the supposed course being mostly under 
water with no indication above the sea level of its existence, which, 
therefore, is presumed from inference only. At the same time the 
beginning and end of the line are pretty obvious, the former being the 
depression described as existing in the south-western part of Haiti, 
