92 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
XIII. Fig. 2) is also apparently a remnant of the same level as the John 
Crow Bench, but the writer cannot positively establish this fact as he 
did not ascend to the summit of this hill. Probably Dolphin Head 
(alt. 1,800 feet) and other points of Hanover near the west end of the 
island are remnants of the John Crow level. 
The next persistent level traceable in the back coast topography 
closely corresponds with the altitude of 1,500 feet. This is etched with 
great clearness upon the outline of the island, being noticeable as the 
long horizontal sky line of many of the so called mountains of which 
Long Mountain east of Kingston is a conspicuous type. On the south 
side of the island this is widely developed at many places, notably at 
Cambridge Hill (alt. 1,521 feet) west of the Yallahs River; Mount 
Salas (alt. 1,561 feet) ; Long Mountain, near Kingston (alt. 1,490 feet) ; 
and several localities along the coast of St. Elizabeth and Manchester, 
and the coast of Westmoreland at Hopeton. Another notable extent 
of this level is seen to the right of Porus along tho railway towards 
Montego Bay. This general level is not visible in the north coast 
topography. 
The next conspicuous bench has an altitude closely approximating 
1,000 feet, the known altitudes ranging from 961 to 1,035 feet. This 
level is that of a greatly dissected plain, which dominates the summit 
topography of the back coast country of the north side of the island 
west of Port Antonio, and out of which all the lower terraces shown in 
the picture of Montego Bay (Plate XX.) have been cut. These summits 
called the * North Coast Ranges ” are especially characteristic of a wide 
strip of country in Hanover, St. James, Trelawney, St. Ann, and St. 
Mary. On the south coast it is well marked, constituting the angular 
bench of the Yallahs Mountain profile, and a conspicuous ridge to the 
east towards Morant Day as shown in Plate XIII. Fig. 2. "These 
benches at the 2,100, 1,500, and 1,000 foot levels, are connected 
phenomena and represent a distinct stage of elevation in Antillean 
history. 
Ficurk 9. Profile, East Side of Montego Bay, showing Benches. 
A lower group of bench levels occurs at altitudes of 650, 300, and 
200 feet, becoming more distinct aud persistent with decreasing alti- 
tude. The terraces of the Montego profile shown in Figure 9 mostly 
