694 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [June 7, 



2. Pythina geoffroyi, Payraudeau. 



Uryci?ia 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. 



Corbula 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 lines arranged 

 lengthwise, but not radiating as in the latter species. Fossil speci- 

 mens are opaque, and therefore do not show the sculpture above- 

 mentioned. 



t/ 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 ; S-70 fms. 



Fossil. Pliocene : Coralline Crag, Monte ]\lario and Sicily. 



The late Mr. Searles Wood proposed to unite the genera Lepton, 

 Lascea, 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. 



y 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. 



)X3. Lepton sulcatulum, Jeffreys. 



L. sulcatulum, Jeflfr. 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 Neoleptoii of Monterosato, and forms a 

 sectional or subgeneric division of Lepton, as I suggested in ' British 

 Conchology.' 



