GEOLOGICAL SOCIETY OF LONDON. 
163 
2. A skull of a walrus, differing from the skulls of the exist- 
ing species {Lrichecus rosmarus^ Linn.), with which it was com- 
pared by Prof. Owen, in having only six molars and two tusks, 
whereas those of the recent have four molars on each side, be- 
sides occasionally a rudimentary one. The front tusk is rounder 
than that of the recent walrus. 
3. Vertebrsp of Cetacea, some of which are referred by Prof. 
Owen to the whalebone-whales, and others to the bottle-nosed 
{Hyperoodon), 
Pisces. — Teeth of sharks resembling species from the Faluns 
of Touraine, viz. Carcharias megaladon, Oxyrhina xiphodon, O. 
hastuUsj and Lamna cuspidata. With these were large teeth of 
two species of Carcharias^ one resembling C. productus, a Mal- 
tese fossil. With the exception of the two last, Mr. Lyell found 
the same species in miocene strata near Evergreen, on the right 
bank of James River in Virginia. 
Crustacea. — A species considered by Mr. Adam "VYhite as 
probably belonging to the genus Cyclograpsus, or the closely 
allied Sesarma of Say, and another, decidedly a Geyarcinus. 
Mollusca. — 1. Casts of a Tellina allied to T. biplicataj a mio- 
cene fossil, and of another near T. lusoria. 2. Cast of a Cythe- 
rea resembhng C. Sayana, Conrad. 3. Three casts of a Myaj 
one of which bears a close resemblance to Mya truncata. 
Mr. Lyell concludes, from the ^" rious evidences here given, 
that the strata of Martha^s V} t d .re miocene. The nu- 
merous remains of Cetacea of nera Balcena and Hyperoo- 
don are adverse to the supposition of their being Eocene, while 
such fossils abound in the miocene beds of America. The other 
fossils all point to a similar conclusion. 
Letter from J. Hamilton Cooper, Esq., to Charles Lyell, Esq., 
V.P.G.S., On Fossil bones found in digging the New Bruniwick 
Canal in Georgia.'^ 
Mr. Cooper prefaces his communication by a description of 
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