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, is 

 the name of Puncturella {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 Pissurella grceca, which has a recurved apex, such as is 

 represented at fig. 4 c, Tab. XVIII, of ' Crag Moll.,' and in this state of things I do not 

 venture to give it as a Crag shell. 



Tectura ? parvula, Woodward. Crag Moll., vol. i, 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 Tectura, 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. 13, in form; but 

 that shell is said to be ornamented with very fine radiating striae, while the Crag shell 

 has raised radiating costulse. Altogether, Tectura parvula must be regarded as a very 

 doubtful species. 



Tectura fulva, Midler. Crag Moll., vol. i, p. 161, Tab. XVIII, fig. 7. 



Localities. Cor. Crag, Sutton. Red Crag, Walton ? Middle Glacial, Hopton. 



In his ' Brit. Conch.,' vol. hi, p. 251, Mr. Jeffreys observes that my specimens from 

 the Cor. Crag, which I described as this species, appear to belong to Lepeta cceca ; but as 

 in his list accompanying Mr. Prestwich's Cor. Crag paper in ' Quart. Jour. Geol. Soc.,' 

 vol. xxvii, p. 145, Mr. Jeffreys inserts Tectura fulva, and omits Lepeta cceca, I infer that 

 he has abandoned that opinion. In his list accompanying the Red Crag paper, 

 however, he inserts Lepeta cceca 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 cceca as a Crag shell. 



