314 
CIRRIPEDES IN THE NORWICH MUSEUM. 
Of this variety Darwin figured a single specimen in the 
Fitch Collection. 
Carina (figd., p. 34, pi. ii., fig. 3) [2148]. 
7. Scalpellum maximum , var. cylindraceum Darwin. 9 
Darwin (op. cit., p. 33) founded this variety on two carinae 
which he said were “ Amongst the specimens from Norwich.” 
It was therefore uncertain as to which collection the valves 
were in. Three carinae were noticed in the Fitch Collection 
registered [2146, 2146a, 2146b] which are referable to this 
variety, but none of these agree well with Darwin’s figure. It 
is quite possible, however, that the carina registered [2146] is 
the valve mentioned by Darwin in his description as “ being 
in a transverse line exteriorly much depressed.” This valve 
is certainly more depressed transversely than the others, and 
in accordance with Darwin’s custom it is cleaned free from 
chalk, so that it may be one of the cotypes. 
S. maximum. The two ocher valves figured by Sowerby were referred 
by Darwin to species of Pollicipes (see footnotes 4 and 5). The carina 
is in the British Museum (Natural History), registered I. 13660. 
9. Whilst examining the Cirripedes of the Sowerby collection in 
the British Museum (Natural History), a carina from Norwicli was 
noticed which struck me as being particularly like Darwin’s figure 
of 5. maximum, var. cylindraceum , and a careful comparison leaves 
little doubt that it really is the valve there figured. This carina is 
broken at the apex, and shows a transverse section precisely as 
indicated in the figure. Moreover it is exactly half the size of 
the figure, which is enlarged to two diameters. The growth-lines, 
although much more conspicuous in its upper part, are certainly 
obliquely inclined to a greater extent, especially on the intra- 
parietes, than is indicated in the figure. Darwin says in his 
description, “ In one of the specimens there is even a difference on 
the opposite sides of the same individual ” ; also “ the upper part 
in one specimen actually retained all the usual characters of 
5. maximum , the precise line where the manner of the growth had 
changed, being distinctly visible.” Since these characters can 
clearly be seen in the present carina, there can be no reasonable 
doubt that it is the original valve figured by Darwin. In these 
circumstances it is here selected as liolotype of S. maximum, var. 
cylindraceum. The specimen is registered I. 13661. 
