222 Scientific Intelligence. 
We still hold that the regular spacing of these arches along the 
under surface renders it very improbable that they were | oe 
Had they been closely crowded together, this argument would 
of less weight ; but while so very slender, they are a apse: of an 
inch apart. Mr. Woodward’s comparison between th 
form of the arches in a Macrouran and that in the “tribolite does 
not appear to us to prove anything. We therefore still believe 
that the specimen does not give us any knowledge of the actual 
legs of the trilobite. Mr. Woodward’s paper is content in vol, 
vii No. 7, of the Geological Magazine. D. D, 
4, Deets on the Geological Structure and Mineral paar 
of Prince sea d Island ; by J. W. Dawson, LL.D., assisted by 
6.2.04 N, Pu. pp. 8vo, with 3 lithographic plates. 
(Printed by. authority of the Ge ernment of Prince Edward Island), 
om this excellent report the following facts. 
The roc a are (1) newer Carboniferous, red-brown and gray sand- 
stones like those of Nova Scotia, and New Br ‘unswick, occurrin 
Seis and the Can necticut Valle y 3 (3) drift epost and (4) 
those of oie date. The unconformability of the ‘ 
of the Trias over those of the Carboniferous i is “ ok pelt percept 
ble,” and in aspect they are often very similar 
In the Carboniferous there are numerous He of coniferous 
trees, the largest observed a foot in ener which are of the 
Species Dadoxylon materiaru va Scotia spe 
ey have afforded also in some localities Calan ki 
ngt., C. cistéi Brngt., C. giga arenaceus Jager, Cor 
eds have a Nake not exceeding 500 feet, and 
the lower a70 feet are regarded as constituting a a lower division. 
ae dip is very small, and the beds are often acyl nt by 
n. 
on on, i in the lower part of the Upper seg or u yer part of 
j thygna 
ucot 
5. Prowliar Prssdwinls observed in by W. a: 
Nixes, Prof. Phys. Geol. and Geogr. in pom Insti- 
tute of P eehnology —The Benen here described are fractures; 
su ttc gre expansions of beds of stone conne 
ey due apparently. to the state of tension to 
which the be tc r sahoctek when in its original state in i 
