50 
THE VOYAGE OF H.M.S, CHALLENGES. 
This specimen, in coloration and in nearly all structural characters, bears a most 
remarkable resemblance to the Herbstia pyriformis (Bell); 1 it differs, indeed, from the 
description and figure of that species only in having the gastric and branchial regions 
more distinctly granulated. The type of Herbstia pyriformis was from the far distant 
Galapagos Islands. 
From Herbstia rubra, as described by A. Milne Edwards, the Challenger specimen 
differs in the coloration, in the absence of the anterior transverse series of gastric 
tubercles and of the spiniform median tubercles of the cardiac region, and in the 
more slender legs. I should not have suspected its identity with this species, had not 
Professor A. Milne Edwards himself remarked upon the near affinity of Herbstia 
pyriformis and Herbstia rubra, 2 and to facilitate the identification of the Challenger 
specimen with the type of the species, I think it useful to figure it. 
The margins and merus-joints of the ambulatory legs are indistinctly granulated, 
and the granules are spinuliform on the first pair of legs, toward the distal extremity ; 
hence this species establishes a transition to the subgenus Herbstiella. 
Herbstia violacea (A. Milne Edwards). 
Micropisa violacea, A. Milne Edwards, Nouv. Archi v. Mus. Hist. Nat., vol. iv. p. 50, pi. xvi. 
figs. 3-6, 1868. 
Herbstia violacea, Miers, Ann. and Mag. Nat. Hist., ser. 5, vol. viii. p. 206, 1881. 
Here is referred an adult female, obtained at St. Vincent, Cape Verde Islands, with 
the preceding species. Its dimensions are as follows : — 
Adult ?. 
Lines. 
Millims. 
Length of carapace and rostrum, 
14 
29.5 
Breadth of carapace, . . • . 
11 
23 
Length of a chelipede, rather over 
12 
26 
Length of first ambulatory leg, 
141 
30-5 
This form differs from the typical species of Herbstia in its more slender eye-peduncles, 
and in the chelipedes, whose dactyli, not only in the females, but also in the males I have 
examined, are nearly straight, acute, and very obscurely dentated or entire on the inner 
margins. 
Herbstia ovata (Stimpson). 
Micropisa ovata, Stimpson, Proc. Acad. Nat. Sci. Pliilad., p. 217, 1857. 
,, ,, A. Milne Edwards, Nouv. Archiv. Mus. Hist. Nat., vol. iv. p. 51, pi. xvi. 
figs. 1, 2, 1868. 
Several specimens of both sexes and of different sizes were collected at St Vincent, 
Cape Verde Islands, in July 1873, with the preceding species. 
1 Trans. Zool. Soc. Lond., vol. ii. p. 44, pi. ix. fig. 1, 1841. 
2 Crust. Podophthalm. in Miss. Sci. an Mexique, p. 77, 1875. 
