1882.] ‘LIGHTNING’ AND ‘PORCUPINE’ EXPEDITIONS. 659 
Bay of Biscay (‘Travailleur’ Exp.), Mediterranean (Spratt and 
others), Adriatic (Stossich), Azores (‘ Josephine’ Exp.), Canaries 
(‘Challenger ’ Exp.), G. Mexico (Dall), New England and Maine 
(Verrill § 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 in 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. ineertum of Philippi but not of Deshayes, D. stri- 
atum of Scacchi, and D. lacteum of O. G. Costa but not of 
Deshayes. 
“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. entalis; 10-570 fms. 
Fossil. Pliocene: 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. 1 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 stricz 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. drevifissum 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. 
¥ 8. DENTALIUM ENTALIS, Linné. 
D. entalis, L.S.N. p. 1263: B.C. iii. p. 191, pl. v. f. 1; v. 
p. 97; pl. Wwe kT. 
‘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, 68, 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- 
