18 NOTES ON THE BEITISH JURASSIC BRACHIOPODA. 



((Spaxiiovj an arm ; ttov^, ttoSo?, a foot), and implies that the 

 animal was "arm-footed." This term Professor King and 

 others objected to on the ground that it was a misnomer, 

 as undoubtedly it is. 



Cuvier was evidently under the impression that the 

 two labial or brachial appendages — the skeletal supports 

 of which we sometimes find in our fossil forms — impro- 

 perly designated as arms or feet, served as organs of loco- 

 motion. 



We shall have occasion to refer to these appendages 

 again later on. 



Although Professor King objected to Cuvier's term, he 

 was not the first to substitute another name ; he simply 

 followed Blainville, who, in 1824, proposed as a substitute 

 for " Brachiopoda " the title " Palliobranchiata " (pallium, 

 a mantle; hraricMce, gills), on account of the respiratory 

 system being, in his opinion, combined with the mantle 

 on which the vascular ramifications are distributed (10, 

 p. 287).* 



This, however, need not concern us greatly ; for whilst 

 we are prepared to honour Blainville in giving the most 

 appropriate name to this group of animals, we are, never- 

 theless, disposed to use Cuvier's term as being the one 

 most generally in use among students of palaeontology at 

 the present time. 



The brachiopods are inhabitants of the sea ; none have 

 yet been found in estuarine, brackish, or fresh- water areas ; 

 hence we may safely infer that the rocks in which bra- 

 chiopods occur are of marine origin. 



As a class they have been represented by some form 

 or other, almost uninterruptedly, throughout the whole of 



* These numbers in parentheses refer to the Bibliography, and to 

 the page of the works referred to. 



