94 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
probably the Cambridge and Manchioneal formations. Below this level 
the low coast Soboruco occasionally occurs in spots, as seen between 
Manchioneal and Hector's River where it stands about 20 feet above 
the sea and tips nearly all the little points of land projecting into it. 
IO 
Fısurs 90. Section of Elevated Reef Rock at Mouth of Priestman River. 
xx. Streamway of Priestman’s River. 
d. Later Terrace of Elevated Reef Rock, 
c. Older Terrace of Elevated Reef Rock. 
b. Manchioneal Beds. 
a. Back Coast Mountains of White Limestone. 
The east end of the south coast line, between the mouth of Hector’s 
River and Bowden, was not examined, and we cannot from personal 
knowledge say whether or not the Soboruco exists there. None was seen 
on the south coast from Bowden to old Port Royal west of Kingston. 
Our traverses between Annatto Bay and Falmouth on the north side 
were mostly through the back coast country, and did not immediately 
approach the sea except at Port Maria, St. Ann Bay, and between St. 
Ann Bay and Runaway Bay, but the Jamaican Reports, in the discus- 
sions of the parishes of Metcalfe, St. Mary, and St. Ann, under the head 
of “Coast Limestone,” give good descriptions of the Soboruco at many 
points along this stretch. 
One mile west of Port Maria a very small patch of Soboruco abuts 
against the foot of the great bluff of Richmond beds shown on Plate 
XXIII. This old reef stands about ten feet above the sea, and is cut 
by waves into detached islets, specimens of which are shown on Plates 
XXX. and XXXI. The material consists of coral heads, of which some 
were over three feet in length and had to be blasted away by the road 
builders. 
Between St. Ann Bay and Runaway Bay, nine miles to the west of 
Port Maria, there is a narrow ribbon of coast plain abutting against a 
background of the flint-bearing Montpelier beds. The lowest Soboruco 
outcrops at several places along this road, and is apparently synchro- 
nous with the Falmouth formation described on a later page, which here 
sometimes replaces or grades into the reef rock. Patches of Soboruco 
tip the points of land to the east and west of Runaway Bay (not noted 
