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Show 1881.] v THE SURVEY OF H.M.S. 'ALERT. 75 1 7 Dana, from the Straits of Da Fuca, Oregon, the rostrum is y-toothed, and in the P. dance of Stimpson from Puget Sound, California, y 3-toothed; in Pandalus franciscorum, Kingsley, also a Californian species, l-~ 2-3-toothed, and in P. gurneyi, Stimpson, -^--toothed. In most of the species of the genus the teeth are much more numerous. In one species, however, the P. leptorhynchus of Stimpson (the only one, so far as I am aware, besides P. paucidens, described from the Southern hemisphere) the rostrum is only ^-toothed; its habitat is Port Jackson, in Australia. STOMATOPODA. S Q U I L L A GRACILIPES, sp. n. (Plate VII. fig. 8.) I designate by the above name a specimen (young male) from the west coast of Patagonia, which is allied in nearly all its characters to Squilla armata, but is distinguished by the more numerous spines of the dactyli of the raptorial limbs (which are ten in number), the obsolescence of the median and submedian and faint definition of the lateral carinse of the first to sixth postabdominal segments, and the form of the terminal segment, which is as long as broad, smooth on its upper surface, with the median carina less distinctly marked, and with about 26 denticles between the submedian marginal spines and about 18 on each side between these and the first lateral spines. The outer spine of the distal prolongation of the base of the uropoda is relatively much shorter than in S. armata. Length 3^ inches. PSEUDOSQUILLA LESSONII. Squilla cerisii, Guerin, Voy. Coquille, Crust, p. 40, pi. iv. fi«\ 1 (1830), S. lessonii on plate. Squilla spinifrons, Owen, Proc. Zool. Soc. p. 6 (1832). Squilla lessonii, M.-Edwards, Hist. Nat. Cr. ii. p. 527 (1837) ; White, List Crust. Brit. Mus. p. 84 (1847). Squilla monoceros, M.-Edwards, Hist. Nat. Crust, ii. p. 526 (1837) ; Gay, Hist. Chile, Zool. iii. Cr. p. 224 (1849). Pseudosquilla lessonii, Dana, Cr. U.S. Expl. Exp. xiii. i. p. 622 (1852) ; Miers, Ann. & Mag. Nat. Hist. (ser. 5) v. p. 113 (1880). Pseudosquilla marmorata, Lockington, Pr. Cal. Ac. Sci. p. 33 (1877). A male and female were collected at Coquimbo. ANISOPODA. ARCTURUS COPPINGERI, sp. n. (Plate VII. fig. 9.) The body is robust, and broadest at the fourth thoracic segment, and is everywhere covered with close-set granules. Head with the anterior margin deeply excavated. The median portion of each of the thoracic segments is elevated, and forms a transverse ridge extending to the lateral margins of the segment; the ridge so formed is narrowest in the middle, but at the lateral margins covers nearly the |