HILL: GEOLOGY OF JAMAICA, 129 
T. W. Stanton of the United States Geological Survey has kindly 
furnished the following determinations of the Mollusca collected by 
ina: — 
(a) From near Catadupa : — Ostrea, sp. ; resembles young of O. com- 
Pressirostra, Carolia jamaicensis, Dall; this is an Eocene genus, Ca- 
prinula, gigantea, Whitf.1?; a fragment. Caprinella occidentalis, Whitft; 
à Small specimen. Caprina jamaicensis, Whitf.'; several small speci- 
Mens. Radiolites rudis, Whitf.!; four specimens (lower valves) that 
Seem to belong to this species. Radiolites adherens, Whitf.* 2; one speci- 
Men doubtfully referred here. Radiolites, sp. ; several fragments of a 
Small strongly plicate species that cannot be satisfactorily identified 
With any of those described by Whitfield. Caridum, sp. ; rather large 
rm. Natica, sp.; casts. Nerita, sp. ; a medium sized smooth form. 
*rithium, sp.; 1, Cerithium, sp.; 2, fragmentary cast of very large 
Species, Thalassa ? sp.; & Purpuroid shell resembling this genus, rep- 
"sented by a fragment. Cypreea, sp. 
(2) From the Railway Cuttings at Cambridge. 
The collection from Cambridge is not so large, but it contains enough 
identica] species (marked *) to show that the same horizons are repre- 
"ented as at Catadupa. 
(^) From near Cambridge : — *Ostrea, sp. Anomia, sp. *Carolia ja- 
Maicensis, Dall. Spondylide (1) genus undetermined ; a peculiar shell 
"wing the form of an Ostrea and resembling a Chama in sculpture 
"hd shell structure. *Radiolites rudis, Whitf,? a single small speci- 
men, Protocardia, sp. Cardium, sp. Lucina, sp.; large casts. Norita, 
BE Shu ml form resembling one of the huge species 
a o i 
Several other indeterminate casts of bivalves and gastropods. The 
Senus Cassis was also identfied from the Cambridge collection by Dall. 
fragment of a Nerinæa also occurs. 
y Pelton Beds. — The upper beds at Chapelton are of later and 
ghtly deeper water origin than the Catadupa, and mark a stage in 
à great Eo-Oligocene subsidence and a transition between the Cam- 
ridge and Montpelier. They are characterized by the same little 
*ctryonate oyster, large Cerithium and Lucina, which are found 
of ¢ as: Several large Echinoderms occur in this horizon. None 
other fossils of the Catadupa beds were noticed by us, while 
8 1 EM x 4 
Pecies of Orbitoides (the species referred to O. mantelli throughout 
1 
num hitherto supposed to have been peculiar to the Cretaceous beds of 
ica, 
VOL. xxxıv, 9 
