OCR Text |
Show 16 ON C R U S T A C E A N S F R O M MAURITIUS. [Jan. 15, small spine ; the postero-lateral angles are not acute in any of segments ; the terminal segment is obscurely longitudinally sulcated above, and is shorter than the rhipidura or appendages of the penultimate segment; it is acute at its distal extremity, and bears a pair of lateral spinules at some distance behind the apex. The antennules have the peduncle dorsally flattened and excavate for the reception of the eyes, the terminal joint is very short, the flagella stout, tapering very slightly, longer than the carapace, and the outer longitudinally concave for the reception of the inner flagellum, as in other species of the genus ; the scaphocerite ot the antennae is slightly longer than the peduncle of the antennules, it narrows somewhat to the rounded distal extremity, and bears a small subterminal spine on its outer margin ; the flagellum is wanting. The outer maxil-lipedes are slender and reach beyond the apex of the antennal scale. The legs of the first three pairs increase successively in length, they present nothing remarkable : the chelae are very slender, with the fingers longer than the palm ; the fourth pair have the merus-joints somewhat thickened, fifth and sixth joints not elongated, dactyli shorter than the sixth joint. The fifth legs are much longer than the carapace; fourth, fifth, and sixth joints all slender and much elongated; dactylus less than half the length of the carapace, and little more than half the length of the penultimate joint, and slightly compressed ; the rami of the rhipidura are narrow, the outer longer than the inner, with a straight outer margin, the inner narrow-ovate. lines. millim. 2 . Length of body about 15 32 Length of fifth legs about 12 25 LEPTOSQUILLA SCHMELTZII. Squilla schmeltzii, A. Milne-Edwards, Journ. d. Mus. Godeffroy, i. (Heft 4), p. 87, pi. ii. fig. 7 (1873). Leptosquilla schmeltzii, Miers, Ann. & Mag. Nat. Hist. (ser. 5), v. p. 13 (1880). A small male of this species, hitherto unrepresented in the collection of the Museum, agrees in almost all particulars with the description and figure of Milne-Edwards, whose type was from Upolu. There can, I think, be no question of the generic distinctness of this form from the typical Squillas. The median rounded keel of the terminal segment is more strongly developed, and the dactyli of the raptorial limbs are six-spined as in the figure cited, not seven-spined as in the description. GONODACTYLUS TRACHURUS. (Plate I. fig. 3.) Gonodactylus trachurus, V. Martens, Sitzungsber d. Gesellschaft. naturforschender Freunde zu Berlin (no. 6), p. 93 (1881). An adult male is in the collection. This species is evidently very nearly allied to Gonodactylus bradyi1, 1 Squilla bradyi, A. Milne-Edwards, in ' Les Fonds de la Mer,' by M M de Folin et P6rier, i. (livr. ix.) p. 137, pi. xvii. fig. 11 (1869). |