Dear Sir

It does not matter in the least about the shell being destroyed if you had obtained all the information required, I have no doubt in my own mind that the shell was Sphærium corneum as described in Gwyn Jeffrey’s book, but I have not been working very long with the mollusca so did not care to be too certain at first, but as you would have named it Cyclas cornea then that is almost conclusive because Gwyn Jeffreys has given the name Sphærium corneum to the Cyclas cornea of Forbes & Hanley.¹

You need not trouble to return either the bettle or the fragments of the shell, at the same time I always see Nature so that altho’ much obliged for your offer you need not send me a copy.²

Allow me to thank you very sincerely for the trouble you have taken in the matter | Yours very truly | Walter D. Crick

P.S. I have other specimens of the same shell if you would care for them.