Search: Darwin Correspondence Project in contributor 
Ball, Robert in correspondent 
1850-1859::1851 in date 
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From:
Charles Robert Darwin
To:
Robert Ball
Date:
26 May [1851]
Source of text:
Christ’s College Library, Cambridge (Fellows’ Papers 54.ii)
Summary:

Obliged for letter about cirripedes attached to turtles’ backs. Genus is Chelonobia, Leach. Cirripedes do not penetrate skin, but surrounding tissue grows up around them.

Asks RB to send S. American Balanus. Already has specimens from Irish coast.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Robert Ball
Date:
8 June [1851]
Source of text:
Christ’s College Library, Cambridge (Fellows’ Papers 54.iii)
Summary:

Thanks for cast and account of cirripede [Chelonobia caretta] burrowing in turtle shell. Believes base of cirripede absorbed by bone below.

Contributor:
Darwin Correspondence Project