286 Correspondence — Mr. G. H. Kinahan — Mr. Champernoime. 



me worth while to place npon record the occurrence of another 

 species from the New Cut, Lincombe Hill, Torquay. 



I have a pygidium in fair preservation, not excessively distorted, 

 but without the shell, which I feel no hesitation in referring to 

 S. crassicauda, Sandberger, from the Lower Devonian of the Eifel 

 and Nassau. My specimen is rather larger than the one figured by 

 the Sandbergers.^ Owing to transverse pressure it has bulged to 

 the left of the axis, giving the latter the appearance of too great 

 width for the species, but this impression is corrected when the 

 pleural portion (somewhat doubled under the bulge) is examined. 

 The right pleural portion is rather imperfect, and a small piece of 

 the flattened extremity is missing ; but notwithstanding these 

 defects, the profile closely corresponds with Sandberger's figure {7a). 



To refigure a well-known species seems unnecessary, but I send 

 the specimen for your examination. A. Champernowne. 



I am happy, after examination of the specimen, to be able fully to 

 endorse Mr. Champernowne's determination of the species. — H. W. 



METHYLOSIS AND PAEAMORPHOSIS. 



Sir, — The statement as it appears in my paper in reference to the 

 above is incorrect. Methylosis is chemical change from without, 

 while Par am orthosis is a molecular re-arrangement without any 

 chemical change. G. Henry Kinahan. 



April Zrd, 1885. 



THE CLASSIFICATION OF THE JURASSIC SYSTEM. 



Correction of typographical error in Dr. Blanford's letter. 



The Editor regrets that by a most unfortunate oversight on his 

 part, the word Callovian, in Dr. Blanford's letter (on the third line 

 from the top of p. 240, in the May Number of the Magazine) was 

 by error printed " Calcarian." The passage should read thus : — 



" I did not attempt to enter into the classification of minor sub- 

 divisions like the Lower Calcareous Grit. But when Mr. Jukes- 

 Browne calls attention to my omission to mention this band, he 

 must have overlooked the circumstance that he has forgotten to 

 notice the far more important Callovian, which intervenes between 

 the Oxfordian and the Cornbrash, and which is one of the best known 

 and most widely-spread subdivisions of the Jurassic system." 



Edit. Geol. Mag. 



JOHN WATSON LAIDLAY. 



John Watson Laidlat, son of John Laidlay, Esq., of Fleetwood, 

 was born at Glasgow on the 27th March, 1808. He commenced his 

 education at a private school at Blackheath, and soon afterwards 

 became a pupil of the illustrious Faraday, with whom he studied 

 practical Chemistry, the enthusiastic pursuit of which had a great 

 influence on all his after life. 



1 "Die Versteinerungen des Eheinisches Schicliteii," — "Systems in Nassau." 

 Atlas, pi. ii. figs. 7, la, lb. 



