52 EE. Desor on the Post-Pliocene af the Southern States. 
borealis, Buccinum undatum, Buccinum plicatum and Scalaria 
groenlandica, so that it may be fairly assumed as paleontological 
evidence that the same ocean extended from Georgia and Florida 
to Cape Cod. 
Along this whole coast the Post-pliocene shells, as has already 
been stated, belong exclusively to recent species, such as now 
inhabit the neighboring shore. There is, consequently, no proof 
whatever that the climate was colder than that of the same region 
at the present day. On the contrary there are positive indications 
of a milder climate, as was already noticed by Mr. Conrad, who 
mark in relation to the fossils of the Neuse, which, with two 
exceptions, are likewise such as now exist on the coast of the 
southern Atlantic states and in the Gulf of Mexico. The two 
exceptions are again G'nathodon cuneatus and Arca ponderosa. 
e island of Nantucket does however not by any means mark 
the northern boundary of the Post-pliocene fauna. The same 
species occur farther north, in the vicinity of Boston. A glance 
at the list of species collected at Sancoti Head (Nantucket) by 
r 
Mr. Edw. C. Cabot and myself, compared with the list of the 
species of Point Shirley (Boston harbor) as given by Mr. Stimp- 
son,t will show how clear the resemblance is. te 
Saneoti Head (Nantucket). Point Shirley (Boston). 
Balanus rugosus, Balanus rugosus. 
Pagurus pollicaris (claws). Mya arenaria, 
Serpula. Solen ensis, 
ya arenaria, Mactra solidissima. 
Sol is. Venus m 
Area ersa. Astarte sulea 
Venus mercenaria. starte castanea, 
Astarte castanea. Cardit 
Cardi realis. Mytilus edulis, 
Ostrea borealis. Modiola modiolus. 
Cumingia tellinoides, Ostrea borealis, 
Crepidula fornicata. Fusus decemcostatus. 
Buccinum undatum Buecinum plicosum 
“* _ plicosum. in’ 
° trivittatum 
; *  ebsoletum 
* Proceedings National Institution, 1842, p.190. | ae | 
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