138 
Mr. P. R. Lowe on the 
from Grand Cayman, and the whole group is distant about 
a hundred and eighty miles in a north-westerly direction 
from Jamaica. Grand Cayman lies one hundred and seventy- 
five miles to the south of the nearest point of Cuba. 
Cayman Brae is nearer by some eighty miles. 
A word on the subject of the geology of the islands may 
be of interest and is necessary in order to appreciate the 
main features of their avifauna, for although politically a 
dependency of Jamaica, geologically speaking the Caymans 
are quite distinct. 
Text-fig. 7.. 
If a map shewing the contours of the sea-bed in this part 
of the Caribbean is examined (cf. Agassiz, 44 Three Cruises 
of the 4 Blake/ ” Bull. Mus. Comp. Zool. Harvard, vol. xiv. 
(1888) p. 99, fig. 57), it will be seen that a deep submarine 
