To A. A. Gould 29 February 
Down Farnborough Kent
My dear Sir
I trouble you with this short note to say that I have sent in the same packet with some books to Prof. Agassiz, a copy of a small volume on Fossil Lepadidæ.—1 You have so very kindly assisted me with specimens, that you have a perfect right to copies of all publications on cirripedes, but as I know you are a member of the Ray Society, & so will shortly receive my work on the recent Pedunculated Cirripedes, I have not sent you a copy, as so many persons have kindly obliged me, to whom I am very anxious to send copies, & for whom I have barely a sufficient number.—2
I am now at work on the sessile species; & hope to complete my work at about the close of the present year. Neither my abilities or health allow me to work with ordinary quickness.—3
Your specimens of Ibla from the Burmah Empire,4 were of the greatest possible value to me, owing to the very singular sexual peculiarities of that species. This note, obviously requires no answer: I send it, merely in fear that you should think that I had overlooked your kindness.
With much respect | Pray believe me | Yours truly obliged | Charles Darwin
Sends presentation copy of Fossil Cirripedia.