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Show 694 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [June 7, 2. PYTHINA GEOFFROYI, Payraudeau. Erycina geoffroyi, Payr. Cat. Corse, p. 30, pi. i. f- 3-5. ' Porcupine' Exp. 1870 : Atl. St. Vigo B. Distribution. Bay of Biscay and Algiers. Fossil. Pliocene : English and Belgian Crags. Gorbula ambigua, Nyst and Westendorff. The internal sculpture of the recent shell is very remarkable, and somewhat resembles that of P. setosa. It consists of numerous microscopic Hues arranged lengthwise, but not radiating as in the latter species. Fossil specimens are opaque, and therefore do not show the sculpture above-mentioned. 1. LEPTON SQUAMOSUM, Montagu. Solen squamosus, Mont. Test. Brit. i. p. 565. L. squamosum, B. C. ii. p. 194, pi. iv. f. 7; v. p. 177, pi. xxxi. f. 2. ' Porcupine ' Exp. 1869 : St. 9. 1870 : Atl. Vigo B. Distribution. Norway to the Balearic Isles ; 8-70 fms. Fossil. Pliocene : Coralline Crag, Monte Mario and Sicily. The late Mr. Searles Wood proposed to unite the genera Lepton, Lasa?a, Bornia, Scacchia, Scintilla, Kellia, Montacuta, and Sphe-nalia in one family under the name of Fragillidse. The only reason given for this family union is that the shells are " small and tender." The present species has some obsolete generic and specific synonyms. 2. LEPTON NITIDUM, Turton. L. nitidum, Turt. Conch. Dith. p. 63 : B. C. ii. p. 198 ; v. p. 177, pi. xxxi. f. 3. ' Porcupine' Exp. 1870 : Atl. St. Vigo B., 26, Tangier B.; and var. levis. Med. : St. 55, Adventure Bank, var. levis. Distribution. Norway to the Mediterranean and Adriatic ; 10- 120 fms. Fossil. Pliocene and Post-Tertiary : Norway, Great Britain, and Italy. Height 0-130 feet. Differs in the degree and even in the absence of sculpture. The variety levis is perfectly smooth ; and I must correct or qualify my remark in the * British Conchology' that this species is invariably sculptured. 3. LEPTON SULCATULUM, Jeffreys. L. sulcatulum, Jeffr. in Ann. & Mag. Nat. Hist. 1859, p. 34, pi. 2. fig. 2a-g: B. C. ii. p. 201 ; v. p. 177, pi. xxxi. f. 3. •Porcupine' Exp. 1870: Atl. St. Tangier B.; Med. Adventure Bank. Distribution. England to Mediterranean and Adriatic, Canaries, and Korea ; laminarian zone to 130 fms. Belongs to the genus Neolepton of Monterosato, and forms a sectional or subgeneric division of Lepton, as I suggested in ' British Conchology.' |