Reviews—Hall’s Canadian Graptolites. 413 
geographical and geological range of the Tichorhine, Leptorhine, 
and Megarhine species of Rhinoceros, with a sketch of their lite- 
rature, clearing up several doubtful points relating to the nomen- 
clature of FR. leptorhinus ; he then describes the enamel structure 
of their teeth, the milk- and permanent dentition of A. megarhinus, 
giving a table of measurements of the teeth, and concludes with 
a comparison between the Megarhine and the several recent species 
of Rhinoceros. This memoir is illustrated by fifteen woodcuts. 
The other paper is ‘On Portions of a Cranium and a Jaw in the 
slab containing the fossil remains of the Archexopteryx,’ by Mr. 
John Evans. Prof. Owen, in his paper on the Archzxopteryx 
read before the Royal Society in 1862, stated that besides other 
less important portions of the skeleton, the head of the bird was 
wanting on the stone. Soon afterwards, Mr. Evans, having 
minutely examined the slab, discovered what he attributed to be 
parts of the cranium and jaw of the bird, and communicated this 
suggestion to Prof. Owen, who concurred with it, and, when his 
paper was published, had the portions referred to engraved on the 
plate containing the Archeopteryx, and called attention to Mr. 
Evans’s discovery in the description of it. Mr. Evans discusses the 
question as to whether the jaw belongs to the Archzopteryx or te 
a fish, but is most inclined (and M. von Meyer is of the same 
opinion) to believe that it is part of the former, as he argues that 
_ there is no reason why the bird which presents so many anomalies 
should not also have been endowed with teeth, especially as there 
are no other bones in the slab to which the jaw might belong, and 
when fossils are discovered in the Solenhofen Limestone they gene- 
rally occur singly, so that the remains of a vertebrate animal found 
upon a slab may usually, with some degree of confidence, be assigned 
to the same individual. 
REVIEWS. 
—_——_- 
I. GRAPTOLITES OF THE QuEBEC Group. By James Harri. De- 
cade 2, Geological Survey of Canada. Montreal: Dawson. 
1865. 
THE remarkable series of Graptolites discovered by the Geological 
Surveyors of Canada have been known to naturalists only from 
the descriptions published in one of the Annual Reports of the Ca- 
nadian Survey by Prof. James Hall. These were sufficient to excite 
the curiosity of all interested in this long extinct family. It was 
evident that important materials would be supplied by the perfect 
specimens towards forming a true estimate of the systematic position 
of the family. But the descriptions referred to structures so different 
from anything known in Europe, that without specimens or good 
drawings it was difficult to estimate what would be their real value. 
In the volume before us, which forms the second decade of the 
‘Canadian Organic Remains,’ (it, however, contains twenty-three 
plates, ) we have the first means of satisfactorily understanding the 
