14 



Mr. A. R, Hunt. 



[Apr. 20, 





Showing 

 arrested 

 growth. 



Not showing 

 arrested growth 

 or doubtful. 



1 nf q I nnTYinAr 



JL<J Veil IlUiilUcl 



of specimens. 





22 



3 



25 





6 





6 





2 





2 





2 



2 



4 





2 



2 



4 





1 





1 







1 



1 





*8 



6 



14 





2 



1 



3 



Troclius zizypliiuus 



1 





1 







1 



1 







I 



i 



X 



Buccinum undatum 



4 



2 



6 





3 



5 



8 



Fusus buccinatus 





2 



2 





5 



1 



6 





58 



27 



85 



Without pretending to affirm that all the cases of arrested growth 

 are due to wave action, it seems to me a significant fact that out of a 

 miscellaneous parcel of shells from the Channel fishing ground, 68 

 per cent, should show signs of damage caused by some agent external 

 to themselves. Notes on the above shells would be out of place here, 

 but it may be pointed out that the oftentimes damaged state of such 

 a sedentary mollusc as Capulus hungaricus may be owing to the fact 

 that it is frequently found attached to pinna, and that pinna is one of 

 the shells frequently found damaged. The frontispiece to Mr. Gwyn 

 Jeffreys' second volume of his " British Conchology " depicts a pinna 

 that has received a decided check to its growth, but by no means a 

 severe one. 



Having shown that disturbance of the bottom is evidenced at 

 depths of a few fathoms by the visible turbidity of the water, and at 

 greater depths by the damage done to shells and by the special pro- 

 vision in their habits and structure to withstand such action, I now 

 turn to the evidence of nautical men as to the existence of submarine 

 wave action, and as to the actual dangers to which vessels are exposed 

 owing to the effects of such action. My first witness will be 

 G. Hay den, the skipper of the Brixham trawler " Pelican/' and 

 though his evidence amounts to little more than the expression of his 

 opinion, it is the opinion of a man thoroughly acquainted with the 

 subject under consideration. I submitted to him the following 

 queries, to which he appended his replies and attested them by his 

 signature : — ■ 



(1.) Do you think the bottom on the fishing grounds off the Start 



