Dear Sir

Another fact similar to the one before communicated to you has come under my notice, on Sunday the 5^th. March at the same pond as the beetle was captured, a female frog that to all appearance had been recently killed was found lying upon the bank; attached to the left hind leg on the outside or shortest toe was a small bivalve of the same species as the one forwarded to you, but not quite so large, this shell measures from beaks to front margin .33 of an inch, breadth from side to side of valve .4 of an inch, width between the beaks .23 of an inch.¹ The leg was severed and kept in water for two days, and then kept for a day in air, with the intention of ascertaining how long the shell would remain attached in air, but this was prevented by the leg becoming dry and shrivelled and the shell becoming separated on the 7^th. March Tuesday, owing to the brittle condition of the leg, the animal in the shell was alive after being attached for 3 days

I need scarcely remark this species of shell is very plentiful in this neighbourhood

Yours faithfully | Walter. D. Crick

Chas Darwin Esq.