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Show 1882.] 'LIGHTNING'AND'PORCUPINE'EXPEDITIONS. 671 1. TECTURA VIRGINEA, Miiller. Patella virginea, Miill. Prodr. Zool. Dan. p. 237. T. virginea, B. C. iii. p. 248 ; v. p. 200, pl. lviii. f. 4. 'Lightning' Exp., St. 4. ' Porcupine' Exp. 1869 : Lough Foyle. 1870 : Atl. Vigo B., 26 (var. conica), 31-34 (same var.); Med. 50, Adventure Bank, off Rinaldo's Chair. Distribution. North Atlantic from Iceland and Norway to Madeira, Canaries, C. Verd I. (de Rochebrune), St. Helena (Melliss)!, Azores, Mediterranean to the Archipelago, and Adriatic ; 0-150 fms. Fossil. Miocene : Marne Vaticano (Ponzi). Pliocene : Red and Antwerp Crags, Italy, Rhodes. Post-tertiary : Scandinavia, Great Britain and Ireland, Italy ; 0-460 ft. For synonyms see ' British Conchology ;' but this species is not the Patella pileolus nor P. asmi of Middendorff, ex vis. typ. With respect to the question as to the relative precedence in date of the generic name Tectura (or Tecture) and Acmaa, I would remark that part v. of the ' Zoologischer Atlas' of Eschscholtz (now before me), which contains a diagnosis of Acmaa, was published in 1833 ; Tecture was published in 1830. The Dorpat edition of the 'Atlas,' published in 1828, does not name any type or species. A n adult specimen dredged by Admiral Acton in the Bay of Naples from 60 fathoms has a completely spiral and persistent apex or nucleus. Some Mediterranean and Adriatic specimens have the same shape and coloured markings as those from the North Atlantic ; and the position of the apex is very variable. I therefore cannot regard the Lottia unicolor of Forbes as a distinct species. Post-tertiary specimens are occasionally very large ; one collected by Thuden in Sweden is two thirds of an inch long. 2. TECTURA FULVA, Miiller. Patella fulva, Miill. Prodr. Z. D. p. 237. T. fulva, B. C. iii. p. 250 ; v. p. 200, pl. lvii. f. 5. ' Lightning ' Exp.: St. 2, 5. 'Porcupine' Exp. 1869 : 1, 6, 9, 68, Little Minch. Distribution. Finmark to Cape Clear, near Heligoland (Weinkauff), Bay of Biscay ('Travailleur' Exp. 1881)!, off Tripoli (' Shearwater ' Exp.)! ;* 10-487 J fms. Fossil. Pliocene: Red Crag, and Sicily. Post-tertiary : Norway ; 100-440 ft. 3. TECTURA RUGOSA \ Jeffreys. (Plate L. fig. 2.) S H E L L oblong-oval, convex, rather thin, opaque and lustreless: sculpture a few slight and indistinct striae which radiate towards the margin; these are crossed by much stronger, close-set, and lamellar or ridge-like striae in the line of growth, which give a wrinkly appearance ; the points of decussation are nodulous; the nucleus and upper part of the shell are quite smooth : colour whitish : beak somewhat incurved and overhanging the front margin : ' Full of wrinkles. PROC. ZOOL. Soc-1882, No. XLV. 45 |