3^^ 



356 Correspondence — Mr. R. M. Deeley — Mr. J. W. Gregory. 



two letters which appeared in " Nature," and which Sir Henry H. 

 Howorth quotes. One was from the pen of Professor Bonney. In 

 it he asks whether the fact that there is a deep submarine channel 

 along the coast of Norway does not render it improbable that the 

 ice-sheet could have crossed it and reached Great Britain. Professor 

 Bonney very wisely does not say that it could not, for he would 

 be a rash man who would say what the snowfall was upon the 

 mountains, and how far the ice would have to move from them 

 before it melted, and the law of supply and wasting was satisfied. 

 However, on the strength of the fact that the question has been 

 asked, we learn that "Prof. Bonney has added a new and striking" 

 objection, "based upon the difficulty an ice-sheet would have in 

 traversing the hollow trough." 



Another letter, also published in "Nature," and written by Prof, 

 Hughes, is also referred to. In this letter Prof. Hughes calls 

 attention to the fact that on such coasts as that of Norfolk great 

 care should be taken, when collecting rock- specimens from the drift, 

 that the boulders are really from the drift, and not ballast thrown 

 overboard or spread along the coast by the wreck of a vessel. 

 When I read the letter I thought it was addressed as a warning to 

 some careless student, but we now hear from Sir Henry H. Howorth 

 that it is an expression of opinion on the part of Prof. Hughes that 

 the officers of the Geological Survey, and other experienced field 

 geologists, who have visited the coast have not been alive to such 

 jDOssibilities. 



I should like to notice the rest of the paper, but to do so would 

 require too much space. Sir Henry H. Howorth having treated the 

 drifts as a hotch-potch of mud, sand, and gravel, instead of a series 

 of deposits formed at different times and under different circum- 

 stances. E. M. Deeley. 



JUEASSIC SPECIES OF CHEILOSTOMATA. 



Sir, — My attention has been drawn to Mr. Edwin A. Walford's 

 articles " On some Bryozoa from the Inferior Oolite of Shipton 

 Gorge," and " On Cheilostomatous Bryozoa from the Middle Lias," 

 both of which were published in the Quarterly Journal of the 

 Geological Society, Vol. L., February, 1894, pp. 72-82. 



I regret that I have omitted to make a reference to Mr. Walford's 

 papers in an article published by me, " On some Jurassic species of 

 Cheilostomata " in the Geological Magazine for February, 1894, 

 pp. 61-64; but at that time Mr. Walford's papers were unpublished 

 save for the abstracts which had appeared in April and June, 1893, 

 during my absence in East Africa. J. W. Gkegoky. 



Erkata. — Sir H. H. Howorth begs us to correct the following 

 errata in his article in the June Number of this Magazine : — 



On p. 260, line 41 from top, for " Hampshire" read Sussex. 



On p. 262, line 8 from top, for " Micael" read Michel. 



On p. 262, line 31 from top, delete the words "among them." 



