130 
THE GEOLOGIST. 
From Caen I took the steamer back to Havre, and thence trudged 
along the shore by Fecamp and Dieppe to Boulogne. A sketch from 
my notebook at Etretat may well close this gossiping article. The 
needles and arches of our Isle of AVight are household words in the 
British geologist's mouth. So are the arches and needles of Etretat 
in every Frenchman's. Etretat was a fishing village. It was fast 
rising, when I was there, into a watering-place ; it may boast by this 
time of handsome rows of marine residences, but it will not be more 
worthy of visiting than when it was as my pencil presents it to my 
readers in Plate IX. 
ON THE OCCUEIiENCE OF ACANTHODES IN 
PALEOZOIC EOCKS. 
By Eet. Hugh Mitchell, M.A. 
"Whatever theory we may conceive or adopt respecting the origin 
of species, it is undeniable but that x\canthodes — a genus of fossil 
fishes — has maintained a noble struggle for life. Known to occur 
first of all in the Lower Devonian or Old Eed Sandstone, it has been 
found also in the Middle Division of that great system, and again in 
the coal-measures, and finally disappears in the Lower Permian — the 
Eoth-todt-liegende or Lower Dyas of German authors. 
In the accompanying table we have endeavoured to put into acces- 
sible and readable shape the particulars of its occurrence, so far as 
known to us, among the rocks. 
The Rocks. 
The Species. 
The Authorities. 
Permian . ^ 
Upper 
Lower 
* 
Acanthodes gracilis, 
Bei/r 
Murchison, Journal of Geol. Soc. 
vol. xix. p. 303. 
Carboniferous ^ 
Upper 
. Lower 
A. Brouni, A^. 
A. sulcatus, Aff. . 
Egerton,Geol. Surv.Dec. 10, p. 57. 
Agassiz, P. F., p. 125. 
Devonian . 
Upper 
Middle 
, Lower 
* 
* 
* 
A. pusillus, 
A. Peachi, F^. 
A. coriaceus, . 
A. Mitchelli, Eff. . 
Agassiz, P. P., p. 301. 
Egerton, Geol. Surv. dec. 10, p. 57. 
Egerton, Geol. Surv. dec. 10, p. 59. 
Eg(;rton, Geol. Surv. dec. 10, p. 61. 
"We first detected the occurrence of Acanthodes in the Lower De- 
vonian or Old Eed Sandstone at Farnell, in the county of Forfar, 
