1882.] 'lightning' AND 'porcupine' EXPEDITIONS. 659 



Bay of Biscay (' Travailleur ' Exp.), Mediterranean (Spratt and 

 others), Adriatic (Stossiek), Azores (' Josephine ' Exp.), Canaries 

 (' Challenger ' Exp.), G. Mexico (Ball), New England and Maine 

 {Ferrill ^ Packard) ; 30-1963 fms. 



Fossil. Upper Tertiaries : S. Italy, Sicily, and Rhodes. 



Prof. G. O. Sars was right in distinguishing this species from 

 D. striolatum ; and I was wrong iu uniting them, although other 

 naturalists may not be satisfied. The shell is usually smooth, but 

 sometimes more or less strongly striated lengthwise towards the 

 point. A specimen from the west of Ireland is more than 3 inches 

 long. See also my remarks in the Ann. «& Mag. N. H. for Feb. 

 1877 and July 1882. 



It is the D. incertum of Philippi but not of Deshayes, D. stri- 

 atum of Scacchi, and B. lacteum of O. G. Costa but not of 

 Deshayes. 



t/7. Dentalium striolatum, Stimpson. 



D. striolatum, Stimps. Proc. Boston Soc. Nat. Hist. 1851, p. 114. 



' Lightning ' Exp., St. 5, 7- 



'Porcupine' Exp. 1869 : St. 3, 23a, Little Minch. 



Distribution. From Spitzbergen and the Faroe Islands to the Bay 

 of Biscay and the Azores, the Mediterranean, as well as all along the 

 eastern coasts of North America from Newfoundland to Maine, off 

 Valentia with D. entails -, 10-570 fms. 



Fossil. Phocene : Sicily. Post-tertiary : Norway, Scotland, North 

 of England; 0-1360 ft. 



As Mr. Norman justly remarked in the 'Journal of Conchology ' 

 for Jan. 1879, it is very difficult to distinguish some Norwegian speci- 

 mens of D. striolatum from D. entalis. I will not say they may not 

 be the same species. The principal difference seems to consist in the 

 present species being less regularly cylindrical and being abruptly 

 pinched up near the point, as well as in the longitudinal striae at 

 that end. It is unmistakably the same species as D. abyssorum of 

 M. Sars, 1858, as he afterwards admitted. Besides the latter syno- 

 nym, it is the D. brevijissum of Brugnone, but not of Deshayes or 

 Nyst. Professor Whiteaves, in 1874, regarded D. attenuatum of Say 

 as identical with D. dentalis of Gould and D. abyssorum of Sars. 

 Judging from specimens named by Professor Verrill "Dentalium 

 occidentale, Stimpson " {D. dentalis, Gould), this is another syno- 

 nym, the specimens belonging to a more strongly ribbed variety 

 of the present species. Not D. striolatum of Risso, 1826, which is 

 a variety of D. dentalis. 



K 8. Dentalium entalis, Linne. 



D. entalis, L. S. N. p. 1263: B. C. iii. p. 191, pi. v. f. 1 ; v. 

 p. 197, pl.lv. f. I. 



'Lightning' Exp., St. 2, 3, 4, 5. 



'Porcupine* Exp. 1869 : St. 1. 2, 6, 9, 13, 14, 18, 24, 25, 33, 

 35, 45a, 456, 64, QS, The Minch, Little Minch. 1870 : Atl. 30. 



Distribution. Iceland, Northern Russia, and Scandinavia to 

 Corunna, Maine, Vancouver I. ; 4-200 fms. It is much more com- 



