130 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
the Jamaican Reports *) becomes exceedingly abundant, constituting the 
larger part of both the marls and limestones. 
In all, this fauna has three species of mollusks connecting it with that 
of Catadupa, but a large number of peculiar fossils characterizing the 
latter are absent. The molluscan forms occurring in the Chapelton beds 
are those which have survived from the Catadupa beds, just as the 
Rudistes of the latter have survived from the lower beds. The difference 
in the prevalent Foraminifera is one distinction between the beds, 
Orbitoides, which have not been found at Catadupa, characterizing the 
Chapelton beds, while the former contains immense quantities of other 
species as enumerated. At Lower Chapelton the following fossils were 
collected by me: Orbitoides,? Anomia,? Lucina,® oyster,? gastropod.? 
The same ‘ Yellow Limestone ” at Mile Post 174, Lucea, and Savanna 
la-Mar road contains Crustacea,? Lucina,? Cardium,? gastropod,? simple 
Coral,* Corbis. 
The Port Antonio Beds. — At a locality west of Port Antonio we cok 
lected casts of the large Cerithium and Lucina previously mentioned; 
and a Vulsella, which characterize the Cambridge beds, and also several 
casts of smaller mollusks, alternating with granular chalks made up ° 
Foraminifera, including some similar to those found at Catadupa. Bagé 
reports the following species of Foraminifera from this locality : Globi 
gerina dutertrei, d'Orb.; Globigerina bulloides, d'Orb.; Milolina re 
minulum, Linné; Amphistegina lessonii, d'Orb. (A. hauerii, d’Orb.) 5 
Orbitoides fortissii, d’Arch. ; O. papyracea; O. complanata ; Orbulin® 
universa; Nodosaria; Vaginulina; Nummulites, sp.; Heterostegine 
Discorbina. 
The material in which these fossils occur at this locality from its Jack 
of color would ordinarily be classed as a white limestone; the beds 
represent a gradation of one of the formations into the other. The 
fauna is that of the Cambridge beds (Chapelton and Catadupa), and 
indicates that either the lithologic nature of the latter has changed from 
a mixed to a pure oceanic character in this portion of the island, or ther 
is a faunal continuity between it and the base of the Montpelier. 
In addition to the forms of the Cambridge beds above mentioned 
Etheridge? has noted that “ A portion only of a Nautilus has bee! 
found in the Yellow Limestone of Spring Mount, St. James ” Parish Y 
1 As determined by T. Rupert Jones. See Jamaican Reports, p. 818, and go 
Magazine, London, 1800, pp. 102, 103. 
2 Found at Catadupa and Cambridge. 
3 No. 81 of Institute collection, 4 Jamaican Reports, p. 328. 
