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Show 1879.] 'LIGHTNING'AND'PORCUPINE'EXPEDITIONS. 585 excellently represents this species; and so does Payraudeau's figure (pi. ii. f. 1) of P. violacescens. A. Inside edge plain or smooth. 1. L I M O P S I S AURITA, Brocchi. Arca aurita, Brc. Conch, foss. subapp. ii. p. 485, t. xi. f. 9. L. aurita, B. C. ii. p. 161, pi. iv. f. 3 ; v. p. 174, pi. xxx. f. 1. ' Lightning' Exp.: St. 2, 5, 7. ' Porcupine' Exp. 1869 : St. 3, 13, 14, 23a, 25, 45, 65. 1870 : Atl. 1, 2, 3, 3a, 6, 8, 9, Vigo B., 13, 24, C. Sagres, 26-30, 36, Tangier B. ; Med. Adventure Bank. Distribution. Shetland, off W . coast of Ireland, ' Josephine' Exp. (JosephineBank, off Gibraltar), Palermo, ' Valorous' Exp., Wellington Channel, 'Challenger' Exp. (off the Azores, Bermuda, and Colabra I.), Japan ; 21-1100 fms. Fossil. Miocene and Pliocene. Denmark, Coralline and Red Crag, Holland, Antwerp, N.W. Germany, S. France, throughout Italy, and near Melbourne. L. obliqua and L. cumingii of A. Adams. Some of his other species require further examination. The shell of L. aurita becomes oblique in the course of growth. In a fossil state it is the L. (Tri-gonoccelia) laevigata of Nyst. B. Inside edge crenated. 2. LIMOPSIS CRISTATA, Jeffreys. (Plate X L V I . fig. 8.) L. cristata, Jeffr. in Ann. & Mag. N. H. Nov. 1876, p. 434. • Lightning ' Exp. St. 5. 'Porcupine ' Exp. 1869 : St. 2, 23, 23a, 36, 40, 47. 1870 : Atl. 2, 9, 17, off C. Espichel, 22, 24. Distribution. ' Valorous ' Exp.; 690 fms. A young specimen of L. minuta is figured (PI. XLVI. f. 9) for comparison with L. cristata. 3. LIMOPSIS MINUTA, Philippi. (Plate XLVI. fig. 9.) Pectunculus minutus, Ph. En. Moll. Sic. i. p. 63, t. v. f. 3, 3a, b; ii. p. 45. L. borealis, B. C. ii. p. 164 ; v. p. 174, pi. c. f. 3. •Porcupine' Exp. 1869 : St. 2, 3, 15, 23, 23a, 36, 45, 65. 1870: Atl. 1, 2, 3, 3a, 6, 9, Vigo B., 13, 17a, 24-34. Var. angusta, St. 25. Smaller, narrower, thinner, and more oblique, slantingly truncated or contracted at the upper part of the posterior side, hinge-line shorter, and having a pinkish-brown stain at the beaks and inside near the back. Some specimens of the typical form are finely and closely reticulated; and in others the concentric ridges are crenated. See Ann. and Mag. (supra cit.) for further particulars as to this species. Distribution. Throughout the North Atlantic in deep water from Finmark to Sicily, C. Good Hope, ' Josephine' Exp. (Azores), Nor- |