132 bulletin: museum of comparative zoology. 



the more extensive exposure at Catadupa where the Rudistes occurred 

 in great abundance. From this last collection Dall identified the 

 Carolia, hitherto known only in the lowest Eocene of Egypt. 



None of the species of the Cambridge beds excepting the Rudistes, 

 the gigantic Cerithium (T), an oyster, and a Lucina, have been reported 

 before from Jamaica. The eight species of corals identified by Vaughan 

 are entirely distinct from the species hitherto reported from the Rich- 

 mond beds at Port Maria by Duncan ; the Spondylidse (]), Nerita, 

 Carolia, and Cyprgsa are forms which apparently were not found by the 

 geologists of the British Survey. Not a single one of the species (de- 

 scribed or undescribed), is like any of the North or Central American 

 forms, unless it is the small Alectryonate oyster and the Cardita. Some 

 of the corals have European analogues if not specific identity ; the gigan- 

 tic Cerithinm-like casts are somewhat similar to forms in the Paris 

 Basin, while the Carolia, as before stated, is a genus hitherto reported 

 from Egypt. 



The Orbitoides of the Chapelton beds, which is a comparatively large 

 species from five millimeters to a centimeter in diameter, occurs in vast 

 numbers in the impure littoral sediments. So abundant are these 

 forms in the parishes of St. Mary, Clarendon, and elsewhere, that the 

 formation could well be termed the ^' Nodular Orbitoidal Limestone," 

 r.s it was originally designated by Barrett,^ were paleontologic names 

 still in vogue. Jones was the first to note the occurrence of Orbi- 

 toides in the nodular limestone ^ (our Cambridge beds), No. 4 of Bar- 

 rett's (Woodward's) section,^ previously specifically reported only in the 

 Hippurites limestone by Woodward and Barrett. He remarked that 

 " In the Western Hemisphere Orbitoides and Nummulinae are very rare 

 above the Eocene group," and that it may be remarked as a point of 

 interest that the Nummulites and Orbitoides of Jamaica are such as 

 are found in South Europe and India. From these nodular Orbitoidal 

 limestones Jones reported Orbitoides and three or four Nummulinoe. 

 Concerning these he said :* "In the Nodular Orbitoidal Limestone 

 of Jamaica [Cambridge beds, R. T. H.] at the base of the White Lime- 

 stone, ... I find a few rather small specimens of the same variety of 



1 As published by T. Rupert Jones. In the text Jones states tliat he " understood 

 Mr. Barrett to have informed liim that the Orbitoides occurred in nodules in clay 

 just underneath tlie great White Limestones." Quart. Jour. Geol. See. Loudon, 

 18G3, Vol. XIX. pp. 514, 515. 



2 Quart. Jour. Geol. Soc. London, 1863, Vol. XIX . p. 515. 

 Geologist, London, 1802, Vol. V. p. .373. 

 Geological Magazine, London, 18G4, Vol. I. p. 104. 



