Correspondence — W. J. Barkas — G. R. Kinahan. 239 



Perrey et ceiix de M, E. Mallet, les soulevements contemporains, 

 etc." — A. D'Archiac, Geol. et Paleont., p. 737, 1866, 



" This found, I will, like a veteran rat, hasten away before I have 

 an old house about my ears." — W. Irving, Little Britain. 



EONNE ON BORNHOLM, DeNMARK, M. JeSPEESEN. 



April 12, 1874. 



HTBODUS, A COAL-MEASURE FISH. 



SiK, — Allow me to correct an error that has inadvertently crept 

 into my paper on the above subject, that appeared in last month's 

 Magazine. The sentence at the foot of the group of illustrations 

 says, "Teeth of Hyhodus (Figs. 1 and 2), compared with teeth of 

 Cladodus (Figs. 3-6)." It should have been, "Teeth of Hyhodus 

 (Figs. 1-3), compared with teeth of Cladodus (Figs. 4-7)." The 

 whole tenour of my paper was to prove Fig. 3 a tooth of Hyhodus, 

 and not of Cladodus. 



Newcastle-on-Tyne. W. J. Barkas, M.E.C.S.E., etc. 



THE FLEET. IN REPLY TO THE REV. 0. FISHER. 



Sir, — The Eev. 0. Fisher has written a short letter, in which he 

 objects to certain statements in my paper on the origin of the Fleet. 

 I did not attempt to disprove Mr. Fisher's theory, as I considered it 

 unnecessary if I gave a better. I don't think I said the present 

 shore-line of the Fleet was formed by marine erosion, because since 

 it became a lagoon it must have been considerably modified ; due to 

 the meteoric waste of the adjoining land, the growth of peaty accu- 

 mulations, and the erosion due to wind and the waters of the lagoon. 

 I should imagine the original shore-line was a gradual curve, while 

 at present it is full of indentations and small bays. 



From what data can Mr. Fisher affirm that there were " never 

 marginal cliffs to the lagoon"? If cliff's had once existed, and com- 

 posed of frail materials, they would long since have disappeared, 

 and all surface traces of them have been obliterated, the ground being 

 now a long gradual slope ; this is the case with the lagoon called 

 Lady's Island Lake, mentioned in my paper. But in drainage or 

 similar works, sections will be exposed showing the site of the cliffs. 

 From the Ordnance Maps I question if any of the margins of the 

 lagoons I enumerated would be considered due to marine erosion; yet 

 in most cases in their vicinity the old sea cliffs can be traced, but not 

 always without railway works or other deep cuttings. 



I strongly suspect if the bank of the Fleet is moving inwards, that 

 the margin of the Fleet will do likewise, and this seems to be 

 allowed by Mr. Fisher, so that if its area is curtailed on one side, it 

 increases on the other, and eventually, if the bank is moved back- 

 wards to the original cliff-line, still the Fleet will be found behind 

 it, or an alluvial flat that can be reclaimed. 



I do not understand what Mr. Fisher means when he says, in 

 connexion with the bays lie enumerates, they "cannot possibly have 

 been formed hy the sea, they must be drowned valleys." Now ail 

 the lagoons I have seen must be " drowned " or submerged valleys ; 



