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Show 1878.] 'LIGHTNING' A N D 'PORCUPINE' EXPEDITIONS. 415 turbinata for the shell of the present species (Poli) ; Patella (Montagu); Orbicula norvegica (Lamarck) ; C. ringens and C. rostrata (Hoeninghaus); Discina ostreoicles (Turton) ; Criopus orcadensis (Leach), and Crania personata (Sowerby and others, not Lamarck) ; var. alba-=- C. suessia (Reeve, in coll. M'Andrew) ! Mr. Dall was quite right in ascribing the original authorship of the generic name crania to Retz, instead of to Philippson, as I had erroneously stated. See Schrift. Berlin. Ges. naturf. Fr. Bd. ii. p. 72, tab. i. f. 2-7, 1781. Philippson published the same name in 1788. Family II. DISCINID^E. Genus DISCINA. DISCINA ATLANTICA, King. (Plate XXIII. fig. 7•) D. atlantica, King in Proc. N. H. Soc. Dublin, 1868, vol. v. p. 170 : Jeffr. in Ann. & Mag. N. H , Sept. 1876, p. 202. 'Porcupine' Exp., 1869, St. 19a, 1366 f. Off the west coast of Ireland, 1240 f. (Capt. Hoskyns). North Atlantic, while fishing up the deep-sea telegraph cable in about 2400 f. (Sir James Anderson), ' Valorous' Exp., 1450 & 690 f. (J. G. J.). ' Challenger' Exp., near St. Paul, 1850 f.; N. Pacific, 1875 f. & 2050 f.; off Bermuda, 2180 f. (Davidson) ! I have also to thank Mr. Davidson for telling me of a mistake in my short description of the animal in the ' Annals' above cited ; and I gladly take this opportunity of correcting it. The word mantle ought to be substituted for " arms." D. atlantica is probably the same species as the Coralline-Crag fossil which Mr. S. Wood at first doubtfully named D. norvegica and afterwards D. fallens, and which Mr. Davidson at first doubtfully named Orbicula lamellosa and afterwards D. fallens. But O. norvegica Sowerby ( = 0. lamellosa, Broderip) is a very different and tropical species of Discina. The genus Discina appears to be the connecting link, at least analogically, between the Brachiopoda and Conchifera through Anomia, both having a similar plug of attachment in the lower valve. EXPLANATION OF THE PLATES. PLATE XXII. Fig. 1. Terebratula caput-serpentis, young; to show the loop : p. 401. * 2. T. tuberata, p. 401. 3. T. trigona, p. 402. 4. T. subquadrata, p. 402. 5. T. vitrea; loop : p. 403. 6. T. vitrea, var. sphenoidea; loop : p. 404. 7. T. tenera, p. 405. PLATE XXIII. 1. Terebratula septata, p. 407'. 2. Terebratella spitzbergensis; loop: p. 409. 3. Megerlia jeffreysi; loop: p. 407. 4. Atretia gnomon, p. 412. |