12 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
the Orbitoidal flints from St. Mary collected by Wall have been studied 
by T. Rupert Jones, and published in the Geological Magazine,’ as 
further commented upon in the paleontologic portion of our paper. Our 
studies enable us to show the exact geological position of these speci- 
mens, which has been hitherto unknown. The Orbitoides are quite 
large, and can be collected usually in close proximity to the flints some- 
times attached to them. They closely resemble the forms so abundant 
in the yellow marls of the Chapelton formation and may be specifically 
identical. 
Under the microscope the entire mass of most of the chalks collected 
by us consists of Globigerine, which at present form great deposits on 
the ocean's bottom between 1,500 and 2,900 fathoms. The specimens 
collected from Montpelier Hill, the foothills north of Savanna-la-Mar, 
Dover, between Annatto Bay and Buff Bay, St. Margaret, and near 
Buff Bay, — widely separated localities, — were entirely made up of 
Globigerine. 
The Montpelier beds are best exposed in the hills of the north side of 
the island in the bluffs of the back coast country along the north coast 
road, notably near St. Ann, Falmouth, and Montego Bay ; from Port 
Antonio westward into Hanover Parish ; and typically along the line 
of the Jamaican railway between Montpelier to Montego Day, and at 
many other places around the island. They are exposed almost con- 
tinuously across the island in the parishes of Westmoreland and 
Hanover, between Anglesea nearthe coast, five miles east of Savanna-la- 
Mar, and Montego Bay via Montpelier, where they have been well 
described by Charles B. Brown under the name of * White Limestone," 
as previously mentioned. Here they constitute most of the uplands or 
hills of the back coast country, except where eroded through in the 
processes attending the making of the sinkhole and cockpit countries. 
In the valley in which Montpelier is situated, and also that near the 
heads of Thicket and Morgan Rivers, many peculiar isolated buttes 
standing upon a floor of Cambridge and Richmond beds are made up of 
the Montpelier limestones; also the railway outs between Montego Bay 
and Montpelier are composed of them. 
They are repeatedly exposed in great thickness along the front of the 
back coast hills along the coast road from Montego Bay to St. Margaret 
Bay east of Port Antonio. At Cinnamon Hill (St. James) the beds are 
almost vertical, inclining to the north coast. Here the limestone of 
homogenous texture is in thin evenly bedded layers at the base, suc- 
1 Quart. Jour. Geol. Soc. London, 1864, Vol. XIV., foot-note page 104. 
