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Show 1877.] COLLECTION MADE BY H.M.S. ' PETEREL.' 73 will be seen to be considerably more elevated than in rubicunda. The colour of the latter is rather paler, except the apex, which is perhaps a trifle deeper in tint. V. CRUSTACEA. By EDWARD J. MIERS. But little attention has hitherto been paid to the Crustaceans of the Galapagos archipelago, except as regards the Oxyrhyncha (vide Bell, Zool. Trans, ii. p. 39 et seq. 1841); and Commander Cook-son's collection contained four species only, two of which are well known and widely distributed, the two others being undescribed. 1. LEPTODIUS COOKSONI, n. sp. (Plate XII. fig. 1.) Carapace smooth, transverse, scarcely at all convex, surface everywhere finely punctulated, the punctulations more crowded upon the anterior part. Frontal margin with the median fissure distinct, obscurely 4-lobed. The frontal, gastric, and antero-lateral regions areo-lated, the areolets and intervening fissures well defined. Anterolateral margins obtuse and rounded, the tooth at the external orbital angle and the first marginal tooth quite obsolete, the three following teeth having the form of obscure rounded lobes. Posterior to the last tooth or lobe of the antero-lateral margin are two or three short, obscure, transverse lines. Anterior legs very strong, granulated; wrist and upper and outer surface of hand with numerous raised reticulating lines ; a blunt tooth at the antero-internal angle of the wrist, and a slight ridge on the upper and inner margin of the hand, terminating posteriorly in a tubercle. Fingers black. Ambulatory legs short, smooth, and without hairs, except on the tarsi, which are closely tomentose. Abdomen of <f 5-, of 2 7-jointed. Length of carapace of 6" about y^ in. Breadth j-^ in. Hab. Charles Island. A single, apparently adult male is in the collection, and a female, much smaller. Their colour (in spirits) is dark reddish brown. This species has altogether the external aspect of a Xanthodius, but has not any trace of the ridge upon the palate, the character upon which the genus was founded by Stimpson. It is to be noted that in Xanthodius this ridge is not produced to the anterior margin of the buccal area, and, therefore, does not completely define the branchial channel; so that in fact the genus Xanthodius occupies an intermediate position between the Chlorodiinae, in which the palatal ridge is entirely absent, and the Oziinae, in which it is fully developed. 2. GRAPSUS PICTUS. Pagurus maculatus, Catesby, Nat. Hist. Carolina, ii. pl. xxxvi. fig. 1 (1743). Grapsus pictus, Latr. Hist. Nat. Crust, vi. p. 69 (1803): M.- Edw. Hist. Nat. Crust, ii. p. 86 (1837). Hab. Charles Island. One specimen of this species, an adult male (length 2 | in., breadth |