140 BULLETIN: MUSEUM OF COMPARATIVE ZOÖLOGY. 
tests of Orbitoides, Alveolina?, and Miliolide, while the interior mass of 
one flint clearly shows the silicified outlines of these remains, 
Concerning these species Bagg comments as follows : — 
“The limestones and flints with numerous Orbitoides must belong to the 
Eocene period, because this genus Orbitoides though sparingly found in Upper 
Cretaceous beds did not become prominent until Eocene time, and, further- 
more, it did not survive the Miocene age and only a few occur in the Miocene. 
Its geologie range is as limited as almost any other single genus in the 
Foraminifera group. 
“The species of Orbitoides called dispansus, Sowerby, is easily recognized 
by its internal structure and its external mammillated surface. This species 
is one of the essential constituents of the Eocene rocks of Scinde and also 
occurs in the Eocene of Southern Germany and Italy. 
“ Nummulites is another genus almost equally important, being limited in 
range to the Tertiary period and rarely found now. We have lately dis- 
covered this genus in the Eocene beds of Vicksburg, Mississippi. 
“The Globigerina limestones of which 48b is a good example, are fine 
illustrations of a rock composed almost entirely of these microscopic organisms. 
It is, however, impossible to state with certainty its age upon this occurrence. 
Since Globigerina cretacea seems to be absent from these limestones we pre- 
sume the rock is to be placed in the Tertiary period." 
Nummulin&, so characteristic of the Eocene of Europe and North 
Africa, but missing in the Kocene of the United States, except in the 
Vicksburg formation of Florida and Mississippi, where they have 
recently been identified by Bagg, have been noted in Jamaica, first by 
De la Beche, next by Woodward, and more fully identified by T.. 
Rupert Jones,’ supposedly from the Orbitoidal beds, in association with 
Orbitoides, and also in the flint, bearing beds of the Montpelier forma- 
tion, which erroneously, as in the case of Orbitoides, owing to the 
stratigraphie misconception, were referred by Jones? and Guppy to the 
Miocene. Operculine are also reported by Jones in the flint of Preston, 
St. Mary, and Brimmer Hill, associated with Nummuline, characteristic 
localities of the Montpelier beds. 
In two papers, Prof. Jones? describes the material and gives the 
localities of certain specimens sent from Jamaica in a manner that, after 
our personal studies of the island, we found no difficulty in recognizing 
1 See papers of these authors previously cited. 
2 Geol. Magazine, London, 1864, Vol. I. pp. 102, 106. 
? The Relationship of Certain West Indies and Maltan Strata, etc., by T. Rupert 
Jones. The Geologist, January, 1864, Vol. VII, No. 73, pp. 104, 105. 
