1882.] 'lightning' AND 'porcupine' EXPEDITIONS. 657 



'Porcupine' Exp. 1870: Atl. St. Vigo B., Tangier B. ; Med. 

 Cartagena B., 50, G. Bona, Benzert Road, G. Tunis, Adventure 

 Bank. 



Bistribution. Finisterre to the Archipelago and Sea of Marmara, 

 Adriatic, Morocco,oflf Cape of Good Hope ('Challenger'Exp.), Canary 

 Isles and Madeira; 0-150 fms. The Irish and Cornish localities 

 mentioned in 'British Conchology,' iii. pp. 196 & 197, are doubt- 

 ful, although it is not improbable that this species may be found 

 there as well as on the opposite coast of France. Mighels, in his 

 ' Catalogue of the Shells of Maine,' gives " D. dentale," saying that 

 a specimen had been taken from the stomach of a haddock caught 

 far out at sea in very deep water. It is more Hkely to have been 

 the D. striolatum of Stimpson. 



Fossil. Upper Tertiaries : Red and Coralline Crag, Antwerp, S. 

 France, Italy, Morea, Archipelago. Post-tertiary : S. France. 



I have noted 1 8 synonyms, the principal being D. novemcostatum 

 of Lamarck and D. costatum of J. Sowerby. D. striolatum of Risso 

 is a variety, and must not be mistaken for Stimpson' s species. The 

 specific names dentalis and entalis are not adjectives. 



/ 2, Dentalium panormitanum (^panormum), Chenu. 



B. panormum, Chenu, 111. Conch, t. 6. f. 13 (1842-47); G. B. 

 Sowerby, Thes. Conch, pi. ccxxiv. f. 18. 



' Porcupine' Exp. 1869, St. 1, 45a, 45*. 1870 : Atl. C. Sagres, 

 3Q ; Med. Capo de Gata, off JijeH, 55, Adventure Bank, 58. 



Bistribution. Bay of Biscay (' Travailleur ' Exp. 1880), Mediter- 

 ranean and Adriatic; 30-195 fms. 



Fossil. Upper Tertiaries : Antwerp Crag, Italy and Sicily. 



Having examined and compared an extensive series of specimens 

 from various places, I have come to the conclusion that, according 

 to the received notions of a species, this must be considered distinct 

 from B. dentalis and not merely a variety. Independently of the 

 much greater length, the ribs are finer and far more numerous and 

 regular, and they are extremely slight or become mere striae on the 

 anterior part or in front. The shell is also more tapering and pro- 

 portionally narrower. It attains the length of 3 or 4 inches. Some 

 specimens have the same pipe at the posterior extremity as in 

 B. dentalis. 



It appears to be B. psendo-antalis of O. G. Costa (but not of 

 Lamarck), D. pseudo-entalis of Scacchi (not of Deshayes), and 

 B. lessoni of G. B. Sowerby (not of Deshayes) in part, D. arguticosta 

 of Brugnone, and B. semiclausum of Nyst. As it has been in all 

 probabiHty confounded by other authors with B. dentalis, it is almost 

 impossible to disentangle the synonymy of both these species. 



(^ 3. Dentalium tarentinum, Lamarck. 



B. tarentinum. Lam. An. s. Vert. v. p. 345, var. B : B. C. iii. 

 p. 195; V. p. J 97, pi. Iv. f. 2. 



'Porcupine' Exp. 1869, St. Galway B. 



Distribution. West of Ireland, Holyhead, Cardigan B., and Bel- 



44* 



