524 Correspondence — Mr. Horace B. Woodicard. 



last in form, which played npoa strong, flattened, bony plates that 

 covered the roof of the mouth. These, like Biplognatlius, are from 

 the Huron Shale of Ohio. 



5. Cienodus Wagneri, Newb., of which a remarkably large and 

 finely preserved palate tooth was exhibited, discovered by Mr. Frank 

 Wagner in the Cleveland Shale, near the base of the Carboniferous 

 system at Cleveland, Ohio. 



6. Spines of two species of Edestus, Leidy, from the Coal Measures 

 of Indiana and Illinois, which show distinctly the structure and mode 

 of growth of these remarkable defensive weapons. They are from 

 10 to 18 inches in length, very massive and strong, and consist of a 

 series of sheathing segments, finely soldered together, each carrying 

 a triangular, creuulated and enamelled denticle from one to two 

 inches in length. 



The spines are symmetrical, and were therefore located on the 

 median line like the spines of Trygon, and were probably the de- 

 fences of large sharks or rays which inhabited the inland waters 

 of the Continent in the Carboniferous a^e. 



coi^s-ssiPon^zDiBisroiE]. 



THE SECTION" AT HOPE'S NOSE. 



Sir, — In the last number of the Geological Magazine (p. 398), 

 the Rev. 0. Fisher gives a good diagrammatic section at Hope's 

 Nose near Torquay, which he and also Mr. Pengelly interpret as 

 showing an unconformity. I examined this section in 1875, and 

 believe that the apparent unconformity is due to a fault whose hade 

 is inclined inwards from the face of the quarry ; this explanation 

 was given in a former Number of the Magazine (Decade II. Vol. IV. 

 p. 453). Besides being a simpler reading of the section than that 

 furnished by Mr. Pengelly, it accords with his statement of " the 

 specific identity of the numerous fossils in the two series " of rocks ; 

 and, may I add that, if I remember rightly, Mr. J. E. Lee informed 

 me soon after I had seen the section, that he had arrived at a similar 

 conclusion respecting it. It is perhaps needless to remark that this 

 interpretation in no ways affects the interesting observations on 

 cleavage made by Mr. Fisher. Hokace B. VVoodwaed. 



HiGHBUKY, I3th Sept. 1884. 



EEPOET UPON THE NATIONAL GEOLOGICAL SURVEYS OF EUROPE. 



SiE, — I should be obliged if you would allow me to state that the 

 "Report" printed in the last Number of the Geological Magazine 

 is from a " proof under correction." Some corrections are needed in 

 this, which will be given, with some additions, in the British 

 Association Report for 1884. -yy^ Topley. 



Geological Survey Office, Jermyn Street, S.W., 

 Oct. 11, 18S4. 



