130 BULLETIN : MUSEUM OF COMPAKATIVE 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 euumerated. At Lower Chapelton the following fossils were 

 collected by me : Orbitoides,^ Anomia,^ Lucina,^ oyster,* gastropod.^ 



The same '* Yellow Limestone " at Mile Post 17^, 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 col- 

 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 of 

 Foraminifera, including some similar to those found at Catadupa. Bagg 

 reports the following species of Foraminifera from this locality : Globi- 

 gerina dutertrei, d'Orb. ; Globigeriua bulloides, d'Orb. ; Milolina re- 

 minulum, Linne ; Amphistegina lessonii, d'Orb. (A. hauerii, d'Orb.) ; 

 Orbitoides fortissii, d'Arch. ; 0. papyracea ; 0. complanata ; Orbulina 

 universa ; Nodosaria; Vaginuliua ; Xummulites, sp. ; Heterostegina ; 

 Discorbina. 



The material in which these fossils occur at this locality from its lack 

 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 there 

 is a faunal continuity between it and the base of the Montpelier. 



In addition to the forms of the Cambridge beds above mentioned, 

 Etheridgc * has noted that " A portion only of a Nautilus has been 

 found in tlic Yellow Limestone of Spring Mount, St. James " Parish in 



1 As determined by T. Rupert Jones. See Jamaican Reports, p. 313, and Geol. 



Mafrnzine, London, 1800, pp. 102. 103. 

 - Found nt Catadupa and Cambridge. 

 » No. 81 of Institute collection. * Jamaican Reports, p. 328. 



