GASTEROPODA. 89 
differing from those producing the shell Capulus. Vor a similar reason I have not 
adopted as a separate species Mr. A. Bell’s C. zncerta, 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.’ 
Catyprrma cHinensis, Zinn. Crag Moll., Vol. I, p. 159, Tab. XVIII, ime, Ite 
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. 
Emarcinuna Fissura, Linné. 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 scen 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. 
EmarGinuna rosea, Bell. Zool. Journ., vol. i, p. 52, pl. 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. ITH, 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, elongata, 
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 Z. fisswra. ‘The most distinet form and 
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