324 
POPULAK SCIENCE REVIEW. 
for the engraver. Discoveries have been made of new and large beds of 
iron ore in the forest unsettled country, upon lands owned by the State. 
The older beds belong to the Huronian system, several thousand feet thick. 
All the rocks appear to have been of sedimentary origin, though often pre- 
senting combinations suggestive of an igneous character. The following is 
their order, in descending scale : — 1. Quartzite ; 2. Hematic and Magnetic 
Ores; 3. Ferruginous Quartzite; 4. Diorite ; 5. Ferruginous Quartzite; 
6., Diorite ; 7. Ferruginous Quartzite ; 8. Diorite ; 9. Ferruginous Quartzite ; 
10. Diorite ; 11. Talcose Schist ; 12. Quartzite ; 13. Laurentian. The copper 
region, under the superintendence of Professor Pumpelly, is being mapped 
upon the scale of 300 feet to the inch. The fieldwork has led to the accu- 
mulation of numerous details respecting the distribution of the several for- 
mations, which cannot be presented in a report of progress, but they have 
necessitated many improvements upon the Geological Map. 
Quality of Ancient Limestone for Building Purposes. — In the u Bulletin 
de l’Academie Eoyale de Belgique,” No. 2, 1871, M. Omalins d’Halloy gives 
a paper of some importance on this subject. The main view of the author 
is that it is not so much the texture of the limestones which has to be taken 
Into consideration, since the structure and texture of these stones may vary 
immensely, and yet they may all be suited for building purposes, provided 
the layers or beds have not been, as very frequently is the case, dislocated 
by geological upheavings, whereby many of these kinds of stone become 
foliated, and do not then withstand wind and weather for any length of time 
without crumbling to pieces. 
A New Chimceroid Fish from the Lyme Regis Lias. — On April 5 last Sir 
Philip Grey Egerton, Bart., read a paper on the above. This fish, for which 
the author proposed the name of Ischyodus orthorliinus , was represented by a 
specimen showing the anterior structures embedded in a slab of lias. It 
exhibited the characteristic dental apparatus the Chimseroids, surrounded 
with shagreen, a very large prelabial appendage six inches long, and termi- 
nating in a hook abruptly turned downwards, and a process which the 
author regarded as representing the well-known rostral appendage of the 
male Chimseroid, but in this case attaining a length of inches, and 
covered more or less thickly with tubercles, bearing recurved central spines 
somewhat tooth-like in their aspect. This appendage is attached to the 
head by a rounded condyle, received into a hollow in the frontal cartilage. 
The dorsal spine, which measured 6 inches in length, was articulated by a 
rounded surface to a strong cartilaginous plate projecting upwards from the 
notochordal axis, and was thus rendered capable of a considerable amount of 
motion in a vertical plane. This structure also occurred in Callorhynchus 
and Chimcera. 
Approximation of the Crinoidea to the Tunicata. — This strange relation- 
ship has been imagined by Mr. J. Rofe, F.R.S., who, in a paper published 
in the u Geological Magazine” for June, supports his views rather ably. 
He says, 11 In some other respects there appears to be an approximation of 
some of the Crinoidea to some of the Tunicata, as in the pyramidal valvulse 
of Cystidea and the Chelyosoma ; and the outer tough bags of some of the 
Tunicata also contain radiated concretions sometimes siliceous, but more 
frequently calcareous, thus approaching the test of the Echinodermata. If 
