Asks JS to compare cirripede specimens with those of Lorenz Spengler to establish comparative nomenclature.
Requests reference to article describing Xenobalanus.
Down Farnborough Kent
My dear Sir
I know well that I have no excuse for troubling you, but you once most kindly said you would compare any specimens with Spenglers; if you would now do so, it would be a very great favour.
In my letter thanking you for your most kind present of Xenobalanus I asked you kindly to inform me where the name is published, & the habitat of the species.—
My volume on the Pedunculated Cirripedes will soon be distributed by the Ray Society: I have given, some curious facts, I think, on the sexes of some Cirripedes.—
With the highest respect | I remain Dear Sir | Yours sincerely
| C. Darwin
To | Professor Steenstrup | The Museum | Copenhagen.
It is quite possible that the specimens sent may not belong to either L. purpurea or balanoides var b. but I think they must.
- f1 1469.f1Lorenz Spengler's cirripede collection, described in Spengler 1790, is housed in the Zoology Museum of Copenhagen University (see Henry and McLaughlin 1986, p. 4).
- f2 1469.f2CD at first believed that the species which he later named Tetraclita radiata was the Lepas mitra described in Spengler 1790. He remained undecided (see Living Cirripedia (1854): 343–4 n., in which CD discussed the differences between the two). Nonetheless, he stated that Spengler's ‘description of the opercular valves makes me think this may be the same species.’ The genus Tetraclita had first been named by Christian Friedrich Schumacher in Schumacher 1817.
- f3 1469.f3Lepas purpurea and L. balanoides, var b lineis rubris, had been described and figured in Spengler 1790, pp. 172, 170. CD believed both were members of the ‘extremely common species’ which he named Balanus amphitrite (Living Cirripedia (1854): 240–6). He discussed problems involved in establishing the nomenclature in Balanidae, complaining that ‘when no notice is taken of such points of importance, as whether the walls are permeated by pores, whether the radii are smooth-edged, whether the scuta are striated, it is impossible to identify with any approach to certainty sessile Cirripedes’ (ibid., p. 241). Many of the species of this family therefore have numerous synonyms.
- f4 1469.f4See letter to J. J. S. Steenstrup, 16 October .