134 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY, 
Miocene, and we are enabled to present it for the first time with appro 
priate stratigraphic data. 
In addition to the Rudistes of Catadupa already described, this fauna 
furnishes many new species of Mollusca, all of which are apparently 
quite distinct from those of the Eocene beds of the North Americal! 
Coastal Plain. More of the forms, as Cerithium and Lucina and Car 
dium, are very large and robust. Of the genera, one at least is new, and 
still unnamed ; another, Carolia, has not hitherto been found in Americ» 
The Catadupa beds also afford specimens of the gastropod genera Conus 
Cyprea, and Thalassa, which have not been found below the Tertiary: 
There are many indeterminate casts of gasteropods in the Catadupa beds 
which have a striking resemblance to those of the Cretaceous beds ol 
Jerusalem Mountain. 
De la Beche has frequently noted the occurrence at many localities of 
the fossils which we now know to belong to the Cambridge beds in tb? 
base of his “White Limestone Series,” such as the association of Ostrem 
Echini, and two large species of Cerithium. In fact, the entire list ° 
species given by him on page 170 of his work most probably came from 
the Cambridge beds. He figures one of the large species of Cerithiun: 
and states that at one time he “considered that it might have been * 
cast of a shell analogous to O. giganteum ; the latter is, however, a mul 
taller shell than the one under consideration, which in general outlin? 
resembles more the C. cornucopic of Sowerby."? It is an interesting 
fact that this fossil also occurs in the Virgin Islands and St. Bartholome” 
as noted by Cleve. 
According to notes kindly furnished us by Stanton, “the evidence Y 
to the age of the molluscan fossils from these two localities is conflictivó 
The forms described by Whitfield under the names Caprinula, Japrinell? 
Caprina, and Radiolites, are all Cretaceous types, and the genera to whi”? | 
they belong are not known to occur elsewhere in more recent formation 
On the other hand, all the other fossils that are well enough preserve 
to be recognizable, have a more modern aspect, none of them being cha” 
acteristic of the Cretaceous. The genus Carolia occurs elsewhere only 
in the lowest Eocene of Egypt. The large species of Cerithium are ® 
Eocene types, and the same may be said of the Cypræa and several othe! 
forms. At any rate, similar species are not known from beds as early a 
the Cretaceous. If the Rudistes and Chamide were absent, there woul 
be nothing to suggest a Pre-Tertiary age for the beds. 
The presence of Rudistes, supposedly Cretaceous genera, in this oth” 
1 Op. cit., Plate 21. 2 Opi tity pp 170, 171, 
