My dear Sir

I like the looks of the Plates now they are complete; but I see several of my corrections have not been fully attended to; I presume that they required too extensive changes.

All the Plates can be printed off, except I, of which I am sorry to say I must see another revise, as soon as you can:—I send the old Proof & my instructions; & by this you will see the little alterations required in Fig. 9.—¹ The more important one, is in Fig 7. (a) & (b) and (f) and (g) all require alterations.—²

In (a) & (b) it is only the upper part which are bad; you have falsely given the appearance of a great central & two great marginal broad ridges.

In (g) (& I did not notice this error before) you have represented a great central ridge, which does not exist, the central ridge is barely larger than all the other small longitudinal ridges or lines.—

In (f) the whole surface is striated as represented, but there is no trace of one line or ridge larger than the others; & where I have put the red crosses, you have made one conspicuous ridge or fold; this must be obliterated.—³

Thanks for the corrections in lettering in Plate II: please see that this is corrected. as I have not put it.

When the Revise of I. is sent me: please return me the specimens you have of S. magnum, undulatus & P. rigidus⁴ —in the wooden or tin Box.—⁵

Your’s very faithfully | C. Darwin

P.S.— | If you so require, I will send up specimens of S. arcuatum ie of Fig 7. in Pl. I.—