266 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Nov. 14, 
i 3. SIPHODENTALIUM LOFOTENSE, M. Sars. 
Siphonodentalium lofotense, M. Sars, Christ. Vid. Selsk. Forh. 
1864, p. 297, t. vi. f. 29-33: B.C. v. p. 195, pl. ci. f. 2. 
‘Porcupine’ Exp. 1869: St. 2,6, 10, 14, 16, 18, 23, 25, 28, 
1870: Atl. 9, Vigo B., 26-30; Med. 50, 55. 
Distribution. Norway, Shetland and the Hebrides, Bay of Biscay, 
throughout the Mediterranean from Marseilles to the coast of 
Syria, ‘ Valorous’ Exp., New England; 30-1750 fms. 
Fossil. Pliocene: Calabria and Sicily. 
An undescribed species, allied to S. lofotense, was dredged by the 
late Mr. McAndrew in the Gulf of Suez; it differs in the mouth 
being encircled by a rim and in the base being bifid instead of 
merely notched. 
4, SIPHODENTALIUM QUINQUANGULARE, Forbes. 
Dentalium quinquangulare, Forb. Rep. Mig. Inv. p. 188. 
Siphonentalis tetragona, G. O. Sars, Moll. reg. arct. Norv. p. 105, 
t. 20. f. 13, a—e. 
‘Porcupine’ Exp. 1869: St. 3, 14, 15,17, 38. 1870: Atl. 1, 2, 
3, 3a, 6, 8,9, 13, 17a, 24-34; Med. 45, 55, Adventure Bank. 
Distribution. Norway, Bay of Biscay and N. Spain, Mediterranean 
from Algiers and Marseilles to the Aigean, Jamaica, Barbadoes, var. 
off Culebra I. (‘ Challenger’ Exp.); 5-650 fms. 
Fossil. Pliocene: S. Italy and Sicily. 
I do not consider this the Dentalium tetragonum of Brocchi or a 
variety of it, to which his and Gmelin’s D. sexangulum (not D. sex- 
angulare of Lamarck and Deshayes) apparently belongs. Speci- 
mens of Brocchi’s species from the Subapennine Tertiaries, for which 
T am indebted to the kindness of Professor Bellardi and the late 
Signor Lawley, are clearly a species of Dentalium, and have the 
base (or apex, whichever it may be‘called) truncated and fitted with 
acentral short pipe as in D. dentalis and allied species. Some of 
these specimens are four-angled, while others have 5 or 6 angles. 
Iam not at all satisfied with the generic place of this peculiar shell. 
The sculpture is that of most species of Dentalium, and the fry have 
also a bulbous or pear-shaped base; but the terminal notches, 
usually one on each side, agree with those in most species of Stpho- 
dentalium. Some Norwegian specimens have five notches, and are 
jagged like S. vitrewm. 1f the position of these terminal notches or 
slits constitutes a generic character, D. subterfissum and D. rubescens 
ought to be separated from Dentalium with much greater reason than 
Antalis. Although the present species is so common in Norway 
and the west of Ireland, as well as southwards to the Mediterranean, 
it has strangely enough not yet occurred in Shetland, where the 
conditions of habitability are similar. 
5. SIPHODENTALIUM VITREUM, M. Sars. 
Dentalium vitreum, M. Sars, Nyt Mag. Naturvid. 1851, Bad. vi. 
p. 178 (Siphonodentalium), 1858. 
