GASTEROPODA. 91 
In the list of Crag shells by Mr. Alfred Bell, ‘Ann. and Mag. Nat. Hist.,’ Sept., 1870, 
as also in the list by Mr. Jeffreys, that accompanies Mr. Prestwich’s Cor. Crag paper, 1s 
the name of Pwuncturella (Cemoria) Noachina, from the Cor. Crag of Sutton. On 
applying for a sight of his specimen Mr. Bell tells me it was a very small one, and has, 
unfortunately, been lost, and my application to Mr. Jeffreys for a sight of the specimen on 
the authority of which he has inserted this species in his list, has also been unsuccessful. 
As Cemoria Noachina (Patella Noachina, Linn.) at the present day is a very northern 
form, I was anxious for clear evidence of its existence in the Cor. Crag. I thought possibly 
it might be the young state of Mssurella greca, which has a recurved apex, such as is 
represented at fig. 4 ¢, Tab. XVIII, of ‘ Crag Moll.,’ and in this state of things I do not 
venture to give it as a Crag shell. 
Trcrura ? pARvULA, Woodward. Crag Moll., vol. 1, p. 162, Tab. XVIII, fig. 8. 
Locality. Fluvio-marine Crag, Bramerton. 
In the ‘ Crag Mollusca’ I observed that this shell might possibly be the young state 
of Patella vulgata which occurs, though rarely, in the Fluvio-marine Crag. Mr. Reeve 
tells me there are only five specimens in the Norwich Museum, and these have been in 
my hands for examination. They are all small, and very thin, which I imagine must be 
from a loss of part of the shell. They are elongated in form, as if they lived upon the 
leaf or stem of a Fucus. ‘The vertex is very excentric, like that of Zectura, but they are 
more distinctly rayed or costated. I confess not to be able to determine their true position. 
They much resemble Lottia alveus, Gould, ‘Inv. Mass.,’ p. 154, fig. 18, in form; but 
that shell is said to be ornamented with very fine radiating stria, while the Crag shell 
has raised radiating costule. Altogether, Zectwra parvula must be regarded as a very 
doubtful species. 
Trcrura FuLvA, Miller. Crag Moll., vol. 1, p. 161, Tab. XVIII, fig. 7. 
Locahties. Cor. Crag, Sutton. Red Crag, Walton? Middle Glacial, Hopton. 
In his ‘ Brit. Conch.,’ vol. mi, p. 251, Mr. Jeffreys observes that my specimens from 
the Cor. Crag, which I described as this species, appear to belong to Lepeta ceca ; but as 
in his list accompanying Mr. Prestwich’s Cor. Crag paper in ‘ Quart. Jour. Geol. Soc.,’ 
vol. xxvil, p. 145, Mr. Jeffreys inserts Zectura fulva, and omits Lepeta ceca, 1 infer that 
he has abandoned that opinion. In his list accompanying the Red Crag paper, 
however, he inserts Lepeta ceca from the Red Crag of Walton as does Mr. Bell also 
(Ann. and Mag., Sept., 1870). I have not, however, yet been able to see anything to 
justify the insertion of Lepeta ceca as a Crag shell. 
