310 REVIEWS. 
two; Zeuglodonta, two; Cetacea, forty-four. There are several species 
described for the first time, and the literary references are very complete. 
he system adopted by Dr. DUM requires some comment. He adopts 
the order Bimana, a step which we regard as retrograde, since modern 
ae fresh in the mind m every student, have proved beyond 
cavil that t group is equi to the order Quad hace The di- 
vision of MUR o Ruminantia and EM aS orders, rank- 
ing with other medaia ea on Bons d eoe or pred of the 
of a homological system. The sian spin of the ae Kai from 
Carnivora has in the same manner little better foundation. The bri 
oft 
case the Squalodons, which embrace ten of the twelve species included, 
must certainly be referred to the Cetacea. "The separation of the Sirenia 
order has met with favor from Owen and others, and is well adopted 
in the present work. 
THE putas EVIDENCES OF PLANT-LIFE.* — In this pamphlet Pro- 
fessor Dawson reviews the different substances which have been sup- 
posed to show Zh plants existed contemporaneously with the Eozóon in 
the Laurentian of Canada. 
nd First, that 
e organie strueture can be detected in ‘the Laurentian graphite; 
condly, that the general arrangement and microscopic structure of the substance corres- 
mds wi the mo and bitu mmer matters 3H Grextae IDreuntons of won 
odern date; thirdly, that if the L 
it has only undergone a metamorphosis similar dn kind to that which organic miaiter in meta- 
morphosed sediment of later age has experi en dotem that the association u the gra ph- 
itic matter witli organic limestone, bed iron o lli 
the probability of its vegetable origin; fifthly, ius t when we consider the immense thie kh ess 
and extent of the Eozoonal and graphitic limestones and iron-ore deposits of the — 
if we admit the organie origin of the limestone of graphite, we must be pre pe ared elie 
that the life of that early period, thongh it ay h 
ously developed. d that it lled. 
accumulation that of any subsequent period." 
sum up these facts 
TE 
copi 
d, in its results, in the way of sinapsia 
FossıL Birps. t — In this little pamphlet Professor Marsh imposes a ne 
hir apud on the science of Paleontology, by the discovery of five iia 
f Cretaceous birds. Among the species there is one, Paleotringa m 
dastribed from the original specimen found by Dr. Morton. he 
first fossil bird bone found in this country, and though referred to by Dr. 
Morton in his Organic Remains of the Cretaceous period, has been hith- 
erto considered a recent specimen, which some accident had been 
b the Cretaceous marl deposits. The forms embrace one large 
‘swimming bird ( Laornis Edwardsianus), two gulls (Paleotringa littoralis 
* On th^ m of the Laurentian of Canada. 
By J. W. Dawson, LL. D., Proceed- 
ings of the Geolog ety, Postponed Papers, Vol. xxvi, chant l. Pamphl vm n 
+ Notice of = Foss Birds from the hited and Tertiary Formations of ‘ie United 
States. st C. Marsh. From American Journal ar Science and Arts. March, 
1870. "adieu 4 
