To W. B. R. H. Dunker   2 June [1851]

Dear Sir

I received only yesterday (!) your letter with the P.S. dated February 4^th , & the valuable Box of Cirripedia. They were delayed, as I am told by M^r. Morris, at Bremen. I thank you very sincerely for all your kindness, for your letter written in excellent English, & for the Cirripedia which I have been very glad to see.¹ I will hereafter return all named, & add some duplicate species not possessed by you. Your collection however is more correctly named than any I have ever seen, but still there are some errors. The Loander specimen is the true B. tintinnabulum, with a purple var. of B. perforatus adhering to it.—² B. tintinnabulum presents a vast range of variation.—

Some six weeks since I returned, through M^r. Morris all the fossils which you so generously lent me, together with some copies of my small & imperfect monograph of the fossil species;³ & M^r Morris enclosed some Books. We both also wrote to you,⁴ & are very anxious to know that you have received the parcel safely, will you kindly soon write me a line. I hope to go in a month to press with the recent Lepadidæ or Pedunculated cirripedes, & will send you a copy when it is published. I have also finished about one-third of the Sessile species.

With much respect | Dear Sir | Your’s sincerely obliged | Charles Darwin To | Prof^r. W. Dunker | &c &c &c