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Bibliography. 455 
_ Not P species belongs exclusively to the middle grnicn: although 
7 are common to the lower and middle portions, viz., P. margaritaceus, 
derus, F lemingii, pustulosus, Keyserlingianus, aculeatus, mesolobus. 
The P. carbonarius_is found only in the upper division. T cora 
semireticulatus, aig pr and kanes appear to have lived from the 
om em 
aication ei a to find that the g dees species have a mech 
greater affinity with the Devonian than with the carboniferous, notwith- 
standing the ene. period which must haye elapsed betwe 
their’ Sh. pres 
er the Ssolb isa distribution of the genus Chonetes, we find there 
are 23 species knownvat present, which number may probably be: in- 
creased when the fontififero deposits of America, New Holland and 
Asia are more ex evertheless the geological results to which 
the known species lead us are deserving of notice. rom the observa- 
tions of M. de Koninck it appears (contrary to the opinion generally 
oe that with the exception of one, not any uf the 23:species»pass 
om one system to another, or even ‘from the lower to the upper = 
of the same system. * 
E, Ra ae H. Davis, M.D. Ancient Monuments of the Missi issippi 
Valley ; compri bide th results of extensive original Surveys aud Explorations. 
vol. imperial 4to. he abe tion price, 
se Races of Men and thei Pra pace power 
. ICKERING, 
‘ ee pdt a “as Memorials of Changes in the 
Relative Level of Sew and Land. 8vo, PP: with maps and illustrations. — E 
C. Camppent Cooper. " Identities of Lig! and At —_— and Elecivi- 
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M MOIRS OF THE GEOLOGICAL SuR REAT - lng ‘and of the Muse- 
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E 
um of Practical lag Lo ie city ie ii, Svo. oi BP: 
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n experiment on the 
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On the mining district of Cardiganshire and ili fare “ 
. Smyth 
On ‘oh cella tio osition of some of the Limestones used for Buildin Par Ss, eS- 
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