To Albany Hancock 10 February 
Down Farnborough Kent
My dear Sir
I trouble you with one line to say that amongst the few remaining & on the cut up & previously (imperfectly as it turns out) examined specimens, I have found plenty of Male Alcippes,—indeed hardly any without some: so that I am in no want of more specimens at present,1 I shd , however, be very glad to have hereafter some few to distribute in a dry state on the continent, when I return the specimens in my possession: & indeed I shd like a few more to examine the form of cavity, though I fancy I have made out this pretty well. You may imagine how peculiar the appearance of the male Alcippe is, when I mention, that, though having had experience how diverse an aspect the males put on, I now know that I looked at a Male, during the first day or two, & never dreamed it was a cirripede!2 I suppose after all you have done in the anatomy of the Mollusca no structure seems very difficult to you to make out,3 but I have found Alcippe one of the most difficult creatures, I have ever attempted to make out.4
Yours very truly | C. Darwin
Has found plenty of male Alcippe on specimens. Would eventually like more specimens. Did not recognise males at first. Has found Alcippe difficult to make out.
Please cite as
Darwin Correspondence Project, “Letter no. 1500,” accessed on 8 December 2016, http://www.darwinproject.ac.uk/DCP-LETT-1500