8IPH0N0DENTALIUM. 139 



ture nearly three times the width of apical orifice. Length as much 

 as 6 mill. {G. 0. Sars). 



Lofoten Is. and other places from Christiania fjord to Haswig in 

 Finmark, 30-300 fras. (Sars and others) ; Hebrides and Shetland,. 

 40-140 fms. (Jeffreys) ; Clyde district and Lismore (Chaster and 

 Heath cote) ; West of Ireland in 90-1630 fms. ; Baij of Biscay, 227- 

 1095 fms. ; Vigo Bay, 20 fms. (Porcupine Exped.) ; Gulf of Gas- 

 cony, 60-80 fms. (Folin) ; Mediterranean and JSgean Seas, 50-1456 

 fms, (Porcupine, Acton, Spratt, Monts.) ; Off New England, 500 

 fms. (Verrill) ; Pliocene of Calabria and Sicily. 



Siphonodentalium lofotense M. Saes, Forh. Vid. Selsk. Christiania, 

 1864, p. 29, pi. 6, f. 29-33 (1865).— Jeffreys, Nature, i, p. 135; 

 Ann. Mag. Nat. Hist. (3), xx, p. 250 (1867) ; (4), ii, pp. 299, 301 

 (1868) ; V, p. 442 (1870) ; vi, p. 74 (1870) ; Brit. Conch., v, 195, 

 pi. 101, f. 2 ; Proc. Roy. Soc. Lond., xxv, p. 199. 



Siphodentalium lofotense Sars, Jeffreys, Ann. Mag. N. H. (4), 

 xix, p. 156 (1877) ; (5), vi, p. 317 (1880) ; xi, p. 395 (1883) ; P. Z. 

 S., 1882, p. 662. — Siphonodentalium lofotensis Sars, Arabas & Ben- 

 oiT, Conch. Viv. Mar. Sicilia, p. 118 (1870). — Siphonentalis lofo- 

 tensis M. Sars, G. O. Sars, Moll. Reg. Arct. Norv., p. 104, pi. 20, f. 

 lla.6; pi. I, f. 3, (1878).— Verrill, Proc. U. S. Nat. Mus., iii, p. 

 395 ; Amer. Journ. Sci., xx, 1880, p. 392 ; Trans. Conn. Acad. Sci., 

 V, p. 558. — Pulsellum lofotense Sars, Chaster & Heathcote, 

 Journ. of Conch., vii, p. 304. 



Specimens from the Bay of Biscay and the Mediterranean are 

 usually much smaller than those from more northern seas. {Jef- 

 freys). 



Jeffreys remarks : "The shell may easily be passed (as it was by 

 me) for the young Dentalium entalis ; but it is more curved and 

 cylindrical, the mouth and corresponding lines of growth slope back- 

 wards, and the margin of the posterior orifice is regularly jagged 

 (having two slight notches on each side), and this extremity does 

 not form a bulbous point in the fry. One of the characters given by 

 Sars (" margine aperturse posterioris integro") should be amended. 

 My observation of the animal agreed with his, except that the foot 

 is vermiform and has a fine point, the disk being expanded and 

 assuming the shape of a flower only when the Siphonodentalium 

 wishes to obtain a fulcrum and keep its place in the sand. The foot 

 of Nucula and Leda is somewhat similar, its disk when expanded 

 resembling the leaf of a palm." 



