122 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
nastrea cyathiformis (Duncan), are also found in the Cambridge Eocene, 
and are Eocene species. 
There are several species of corals in our collections from Jerusalem 
Mountain, including, according to Vaughan, a Cladocora, — a genus not 
hitherto found fossil in the West Indies. Vaughan remarks that there 
are other undetermined species from the Cretaceous of Jamaica different 
from those already reported by Duncan. Nowhere in the Continental 
American Cretaceous, except in Southern Mexico described by Felix 
and Lenk, is there a diversified coral fauna, and the latter belongs to 
lower beds. No comparison has been as yet instituted between the 
Mexican-Jamaican Cretaceous corals, however. 
The Mollusca, with the exception of the Rudistes, are very poorly 
represented. The eight genera of Gastropoda found are all poorly pre- 
served casts, mostly from the Jerusalem beds, with the exception of 
Actwonella, which also occurs in the Logie Green. The four pelecypods 
other than the Rudistes are mostly from the upper marls of the Jerusa- 
lem beds. This faint representation of Pelecypoda in the Cretaceous 
of Jamaica is a most remarkable feature. Numerically the fauna is 
predominantly Rudistean ; these forms always occur in all the fossilif- 
erous beds, even when others are unrepresented. They compose the 
mass of the Jerusalem limestones, and occur singly in the occasional 
clay beds of the Ballard and Catadupa beds. 
Specimens of this Rudistean fauna collected by Nichols have re 
cently been described by Whitfield.* It is unique in specific features, 
being entirely different from that of Europe and North America, 
especially that of Texas, where Rudistes are very numerous in tho Ed- 
wards formation of the Lower Cretaceous (unless X. micholassí is allied 
to a form of the Upper Cretaceous of Alabama and Texas). The 
absence of the genus Hippurites, so abundant in the Upper Creta 
ceous of Europe and Southern Mexico, is also noticeable, although this 
genus is missing from the Cretaceous of the United States. On? 
genus, Barrettia — included in the Rudistes by Woodward," and re 
cently asserted by Whitfield not to belong in this group at all — has 
no known representation elsewhere with the possible exception 9 
Guatemala, where it has been questionably reported by Sapper 
1 Bull. Am. Soc. Nat. Hist., New York, 1897, Vol. IX. 
2 The Geologist, London, 1862, Vol. V. pp. 872, 877. 
8 Bull. Am. Soc. Nat, Hist, New York, 1807, Vol. IX. pp. 288-246, Plate? 
XXVIL-XXXVIII. 
* Reported by Sapper from Guatemala. Physical Geography of Guatemal® 
Petermann’s Mitteilungen, No, 113, Gotha, 1894, p. 9. 
