Darwin Correspondence Project

Down Farnborough Kent

3^d

My dear Huxley

I think your Diagrams will do very well.— What an advantage to be able to sketch easily! no one has a right to attempt to be a naturalist who cannot.— I have made a few pencil marks— The chief correction is the position of the great ganglion, which ought to be more to left-hand.— I never c^d see cement-gland in Lepas, though I traced cement-duct some way up peduncle; but from the analogy of 4 other genera its most probable position is where I have put cross.

I think the stomach ought to be larger, though of course there is some variability in its size according to its contents &c. in same species.—

Yours very sincerely | C. Darwin [DIAGRAM HERE] The lower end of œsophagus rather more bell-shaped; more medial; whole upper end of stomach broader, as I have put it: cæca arise where bell-end of oesophagus joins the stomach— Put the Cement gland (see my Pl. IX fig 3) here: & let the ovarian tubes & cæca branch out & fill the whole peduncle.— In Peduncle there ought to be transverse & oblique muscles It w^d be more strictly correct, but really does not signify on this scale, if the antennæ were put a little more to left. ie not quite medial, or not at basal point of peduncle. [DIAGRAM HERE] The main sub-œsophageal ganglion ought to be more to left, where I have put pencil cross— The whole stomach ought to be larger & I think this w^d also make your drawing plainer: you had better not have put in cæca, as their presence is evidently of very little importance. The arborescent testes ought to extend posteriorly over whole stomach, but perhaps you purposely leave them out to prevent confusion.— You had better draw two thin reddish-brown lines from the ovaria to within the Antennæ.