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Show 936 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [NOV. 29, 5. THRACIA CORBULOIDEA, de Blainville. T. corBuloidea, de Blainv. Diet. Sc. Nat. xvi. p. 514 ; Atlas, pi. 76. f. 7. 'Porcupine' Exp. 1870: Med. St. Cartagena B. (fragment). DistriBution. S.W. France, Mediterranean and Adriatic. Fossil. Pliocene : Red ? and Coralline Crag, Italy. Post-tertiary : Calabria. Syn. T. infiata, J. Sowerby, T. suBtilissima of Renier according to Nardo, T. maravigna, Aradas and Calcara according to Aradas and Tiberi. The young is T. meneghiniana of Aradas. The specific name is erroneously spelt corBuloides by modern authors. Family XX. CORBULID^E. 1. P O R O M Y A G R A N U L A T A , Nyst & Westendorff. CorBula granulata, Nyst & West, Coq. Foss. d'Anvers, p. 6, pi. iii. f. 3. ' P. granulata, B. C. iii. p. 45, pi. ii. f. 3; v. p. 191, pi. xlix. f. 1. 'Lightning' Exp. St. 2. 'Porcupine' Exp. 1869 : St. 1, 23a. 1870 : Atl. 10, 24, C. Sagres, 24, 26-30,36 ; Med. Cartagena B., 50, Benzert Road, Adventure Bank, off Rinaldo's Chair. Distribution. Loffoden Is. to the iEgean and Adriatic, Madeira, G. Mexico, off Barbadoes and Sombreros (' Blake' Exp.), N e w England and Maine ; 15-300 fms. Fossil. Pliocene: Coralline Crag, Antwerp Crag, S. France, Calabria and Sicily. Not P. granulata of Philippi from the Miocene formation of N . W . Germany. 2. POROMYA NE^EROIDES, Seguenza. (Plate LXX. fig. 8.) P. nearoides, Seg. Boll. d. R. Com. geol. 1877, p. 270. ' Porcupine' Exp. 1870 : Atl. St. 23a, 24, 28a. Valves. Distribution. G.Mexico; 114 fms. Fossil. Pliocene : Calabria and Sicily. P. tuberata, Jeffreys M S . The present species differs from P. granulata in having greater breadth in proportion to the length, in not being strongly angulated on the posterior side, and especially in the sculpture, which consists of close-set longitudinal lines of minute prickly tubercles instead of irregularly disposed granules. A. Smooth. Typical. 1. N E ^ E R A T R U N C A T A 1 , Jeffreys. (Plate L X X . fig. 9.) S H E L L squarish, very convex, moderately solid, opaque, glossy : sculpture, smooth, with the exception of irregular but rather numerous lines of growth ; rostrum short but broad, separated or defined by a gradual indentation; it has two slight ridges or keels extending outwards from the beak at an acute angle : colour whitish : margins Lopped off. |