_ 1908-9.] THE GEOLOGICAL CONNEXIONS OF THE CARIBEAN REGION. 385 
cultrata. raphanus. 
italica. vertebralis. 
Uvigerina pygmeza. consobrina 
schwageri. comata. 
asperula. Pulvinulina menardi. 
Orbulina universa. elegans. 
Globigerina buloides. Rotalia soldanii. 
Lagena marginata. Amphistegina lesonii. 
Truncatulina culter. Ellipsoidina ellipsoides. 
Planorbulina ariminensis. 
As the sample was only a small one it is probable that additional 
material would reveal a full set of foraminifera. This marl also contains 
molluska and polyzoa, a nucula being perhaps the most abundant mollusk. 
The radiolarian rock. 1 now return to the white limestone or 
radtolarian rock, of which I have already given a brief account, and 
which has been referred to and described by previous writers on the 
Geology of Jamaica. The rock is difficult of disintegration, so I do not 
attempt to give a list of the foraminifera contained in it, but will merely 
say that they appear on the whole to be the same species as those found 
in the Oceanic Rocks of Barbados and Trinidad. Globigerina, as usual, 
greatly predominates. Of this rock Mr. Earland says: “ The Jamaica 
chalk is unquestionably a deep sea deposit, but it would be hard to say 
at what depth it was laid down. Probably, however, no less than 1,200 
—1,500 fathoms, judging from the sections I[havecut. I did not succeed 
in disintegrating it sufficiently to work out the foraminifera, but I 
decalcified a small piece, and was struck with the abundance of the 
sponge remains.” Gregory says of the corresponding Cuban deposits, 
“They proved to be typical pure oceanic oozes.” My investigations led 
me to the conclusion that the spicules, which are very numerous, are not 
as I at first imagined the spicules of sponges, but the broken off spines 
of radiolaria. One specimen of a radiolarian that I found entire was 
similar to Ehrenberg’s Ceratospyris ateuchus (Barbados Polycisten Mergel, 
1875, Pl. XXI, F. 4) except that the long spines did not curve outwards 
but continued the original curve so as to form a figure resembling 
roughly in outline a crab like corystes, and having small spines along the 
exterior curve of the long spines which represent the claws of the crab. 
The body of this was 0.075 mm., while the entire length, including the 
spines, was O'4 mm. Specimens like Ehrenberg’s, plate XIII, Fig. I 
(Podocyrtis princeps) are common, and the long spiculae are only occa- 
