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Show 1879.] ' L I G H T N I N G ' A N D ' P O R C U P I N E ' EXPEDITIONS. 579 C. Espichel, 22. This form appears to be the variety salicensis of Seguenza. Another variety, which I would call semistriata, is smoother, thinner, more glossy, and is partially striated either at the anterior end only or towards the front margin. It occurred in the 'Lightning' Expedition, Station 6, and in the 'Porcupine' Atlantic Expedition of 1870 at the following Stations, 2, 3, 6, 8, 9, 17, 24, 26-28a, 30-54. Young specimens of both varieties are nearly oval. Distribution. 'Valorous' Exp. (var. salicensis), 'Josephine' Exp. (off the Azores ; var. semistriata) ; 550-1750 fms. FossiL Pliocene. Vienna Basin, Italy from Leghorn to Messina. Var. semistriata, Messina. B. Rounded at both ends. 15. LEDA SERICEA, Jeffreys. (Plate XLVI. fig. 1.) L. sericea, Jeffr. in Ann. and Mag. N. H . Nov. 1876, p. 432. 'Porcupine'Exp. 1869: St. 19, 21, 30. 1870: Atl. 1 (var. ovata, longer in proportion to the breadth, but having the characteristic sculpture of the species), 16, 17, 17a. Distribution. ' Valorous' Exp.; 1450 fms. 16. LEDA JEFFREYSI, Hidalgo. (Plate XLVI. fig. 2.) L. lata, Jeffr. in Ann. and Mag. N. H. Nov. 1876, p. 431. 'Porcupine' Exp. 1869: St. 9, 20, 30, 31. 1870: Atl. 16, 17, 17a. Distribution. 'Valorous' Exp., ' Challenger' Exp. (between the Azores and Bermuda) ; 690-1785 fms. Dr. Hidalgo, in his work above mentioned, has pointed out that the specific name lata (which I gave this shell) had been preoccupied by Mr. Hinds in the ' Zoology of the Voyage of H.M.S. Sulphur' (1845) for a New-Guinea species, and that, although named there Nucula lata, it belonged to the genus Leda. He accordingly proposed to cancel the name lata and call the present species by my own name, a compliment for which I am grateful. 17- LEDA SUB^EQUILATERA l, Jeffreys. (Plate XLVI. fig. 3.) S H E L L transversely oblong-oval, nearly equilateral, somewhat depressed, rather thin, glossy, semitransparent: sculpture none except a few irregular periodical lines of growth : colour whitish : epidermis yellowish-white: margins obtuse-angled and pinched up at the back, equally rounded at each end, slightly produced or extended on the anterior side, gently curved in front: beaks almost central, prominent, rather gibbous, and incurved: lunule wanting, in consequence of the pouting and sharp margin at the back: cartilage and pit very minute, the latter sunken: hinge-line obtuse-angled: hinge-plate rather narrow, but strong: teeth small, erect and comblike, 8 on each side, besides 4 or 5 minute tubercles near the beak; 1 Nearly equilateral. 37* |