BIVALVIA. Nati 
Moprona piscors, Linn. Crag Moll., vol. u, p. 63, Tab. VIII, fig. 5. 
Locality. Chillesford Bed, Chillesford. 
In vol. ii of ‘Crag Moll.’ I assigned with doubt to this species a specimen obtained 
from the Chillesford Bed, but I have not seen it from any other Hast Anglian formation. 
In the list to Mr. Prestwich’s ‘Cor. Crag’ paper this species is entered (J/odiolaria 
discors) as a shell of that Crag from Sutton, but I have not seen the specimen upon which 
that entry is based. I have re-examined my own specimens of Modiola in the British 
Museum and do not recognise the species among them. 
Moprota Patacna, Scacchi. Crag Moll., vol. ii, p. 60, Tab. VIII, fig. 66 (as JZ 
costulata, var. Petagne). 
Localities. Cor. Crag, Sutton; and Red Crag, Walton Naze. 
In the ‘Crag Moll.’ I figured this shell as a variety only of costulata, following in 
this respect Philippi’s earlier rather than his later view, and not desiring to swell the 
number of species where it could be avoided. The Mediterranean authors, however, 
keep the two forms as distinct species, and therefore I, not from my own judgment, but 
in deference to these authors, have here assigned Pefagne as a separate species. 
Moprioua puaszoLina, Pdi. Crag Moll., vol. ui, p. 59, Tab. VIII, fig. 4. 
Localities. Cor. Crag, Sutton, Ramsholt, and near Orford. 
This is another shell which I figured at the above reference, and I have since then 
found several additional specimens; but whether they be specifically distinct from the 
young of Modiola modiolus is very doubtful (see ‘ Crag Moll.” p. 59). There is not, I 
fear, any sufficient difference in their forms, or any other character by which phaseolina 
can be specifically distinguished from modolus. Both forms are present in the Crag, and 
I have permitted their names to remain separate. 
Nucuna Cossoupiaz, J. Sow. Crag Moll., vol. ii, p. 82, Tab. X, fig. 9; and 
Supplement, Tab. X, fig. 2. 
Localities. Red Crag, Sutton, Bawdsey, Felixstowe, Waldringfield, and Butley. 
Fluvio-marine Crag, Bramerton, Thorpe, Bulchamp, Thorpe by Aldbro, and Yarn Hill. 
Chillesford bed, Chillesford, Aldeby, Easton Cliff, and Bramerton. Lower Glacial, 
