GASTEROPODA. 89 



differing from those producing the shell Capulus. For a similar reason I have not 

 adopted as a separate species Mr. A. Bell's C. incerta, thinking that it is probably only a 

 distortion of this nature of one or other of the species of Capulus described and figured 

 in the ' Crag Mollusca.' 



Calyptr^a chinensis, Linn. Crag Moll., Vol. I, p. 159, Tab. XVIII, fig. 1. 



Localities. Cor. Crag, Sutton, Ramsholt, and near Orford. Red Crag, passim. 

 Fluvio-marine Crag, Bramerton. Chillesford Bed, Aldeby. Middle Glacial, Hopton. 



This species has occurred within my knowledge at all the above localities. The apices 

 of the shell are not uncommon in the Middle Glacial. The large squamose and 

 imbricated form of this shell appears to be confined to the Coralline Crag, and to the 

 Walton Red Crag, the specimens from all the other localities being the small living 

 British form. 



Emarginula fissura, Linne. Crag Moll., vol. i, p. 164, Tab. XVIII, fig. 3 a. 



• Localities. Cor. Crag, Sutton, and near Orford. Red Crag, Walton, Sutton, and 

 Butley. Middle Glacial, Hopton ? 



This is one of the most abundant shells of the Coralline Crag at Sutton. 

 Among these specimens may be seen very great variation both in the radiatory lines and 

 the cancellation, also in the comparative height and in the position of the vertex. This 

 point or apex is in some subcentral, in others it nearly overhangs the base of the shell ; in 

 some this vertex is much elevated, in others depressed with every intermediate gradation. 

 A fragment of a shell of this genus, the sculpture on which seems to agree with 

 fissura, has occurred in the Middle Glacial of Hopton. 



Emarginula rosea (?), Bell. 



Emarginula kosea, Bell. Zool. Journ., vol. i, p. 52, pi. iv, fig. 1, 1824. 



Locality. Cor. Crag, Sutton. 



Mr. Jeffreys gives this species as present in my collection in the British Museum 

 (' Brit. Con.,' Vol. Ill, p. 261), and I have, therefore, inserted the species as a Cor. Crag 

 shell with a note of interrogation, for I am not able myself to detect a sufficient difference 

 among the many variable forms to justify their separation ; rosea, cancellata, elongaia, 

 and decussata, may, perhaps, all be found among my specimens, but they so graduate 

 into each other, and having all lived together, that I cannot venture on my own 

 authority to call them specifically distinct from B. fissura. The most distinct form and 

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