﻿SUPPLEMENT TO THE CRAG MOLLUSCA. 



Pholadidea papyracea, Solander. Supplement, Tab. X, fig. 27, and Crag Moll., vol. ii, 



p. 298, Tab. XXX, fig. 10. 



Locality. Cor. Crag, Sutton. 



In the ' Crag Moll.' I figured two disconnected fragments from the Cor. Crag of Sutton 

 of what appeared to me to belong to this species, and I have recently found a small 

 specimen which undoubtedly belongs to it. This is figured in Tab. X of this 

 Supplement and is from the same locality of Sutton. 



In Mr. Jeffreys' list appended to Mr. Prestwich's paper (p. 485) this species is given 

 as occurring in the Red Crag, but as no special locality is mentioned for it and I have 

 not been able to see the specimen, I cannot admit the species as a Red Crag one. 

 The figure I gave in 'Crag Moll.,' PI. XXXI, fig. 23, is the representation of what 

 I believe to be an extraneous fossil doubtfully belonging to this genus. 



BRACHIOPODA. 1 



This division of the Mollusca is composed of animals that are considered to be of 

 lower organisation than the Bivalvia. Although Brachiojioda are strictly bivalvia they 

 differ essentially in their internal organisation from the rest of that class, and they have 

 in consequence been separated from that section of the Mollusca. 



The animals and shells of this group have been thoroughly examined by several of 

 our ablest comparative anatomists and microscopists, and I must refer the reader to 

 the elaborate work of Mr. Davidson, where the history of the entire Order is most ably 

 given. 



Although I defer to the much better knowledge of the subject, and adopt the terms 

 of that gentleman, I cannot but repeat the objection which in my ' Monograph of the 

 Bivalves of the Eocene Mollusca ' I have made to the terms " anterior " and " posterior " 



1 The name of the ' Crag Mollusca' given to my Monograph has been objected to, on account of its 

 omitting a portion of the fossils belonging to this class, and, therefore, does not fulfil the conditions 

 required by the title. It was originally intended that the work should comprise everything belonging to 

 the Mollusca which has been found in the Crag, but after its commencement Mr. Davidson undertook to 

 describe for the Palaeontographical Society all the fossil Brachiopoda of Great Britain, and I thought those 

 of the Crag could not be excluded. The Crag Brachiopoda being so few, and a desire having been expressed 

 by several persons that the ' Mollusca of the Crag ' should be made complete, the opportunity afforded by 

 the Supplement has been taken to include them. 



