DENTALIUM-ANTALIS'. 43 



jagged, owing to that part of the shell being nearly formed and con- 

 sequently much thinner than other parts; at the posterior or nar- 

 rower end it is usually truncated in adult specimens, and furnished 

 with a very short sloping and oblique pipe or tubular appendage 

 having a pear-shaped orifice ; there is also occasionally at the point 

 on the convex side a notch or groove, in a line with the front or 

 smaller j^art of the tubular appendage, and this notch is rarely ex- 

 tended into a short and narrow slit or channel. {Jeffreys). 



Length 37-42, diam. of aperture 4*5-5 mill. 



Spltzbergen, Scandinavia, Iceland, and Atlantic coasts of Europe, 

 south to Spain, 3-1750 fms. Coasts of Maine and ^lassachnsetts, 

 north to Bay of Fundy. 



D. entalis Linn., Syst. Nat. (10), p. 785 ; (12), p. 1263.— Penn- 

 ant, Brit. Zool., iv, p. 145, pi. 90, f. 154 (1777). — Lamarck, An.s. 

 Vert., V, p. 345 (1818).— Forbes & Hanley, Nat. Hist. Brit. Moll, 

 ii, p. 449, pi. 57, f. 11 (1853).— Hanley, Ipsa Linn. Conch., p. 437, 

 548 (1855).— Reeve, Conch. Syst., ii, p. 6, pi. 130, f. 3 (1842).— 

 Jeffreys, Brit. Conch., iii, p. 191, pi. 5, f. 1 ; v, pi. 55, f. 1 (1865) ; 

 P. Z. S., 1882, p. 659.— Watson, Challenger Scaph. & Gastr., p. 5 

 (1885). — D. entale L., and D. antale of some authors. Not D. en- 

 talis or D. entale of writers on Mediterranean shells, or of Searles 

 Wood and some other palaeontologists. — D. entalum De Blainv., 

 Diet. Sc. Nat., xiii, p. 70. 



D. striolatam &1TIMPSON, Proc. Bost. Soc. Nat. Hist., iv, p. 114 

 (1851); Shells of New England, p. 28 (1851).— Entalis striolata 

 Stimp., Gould-Binney, Invert, of Mass., p. 266, f. 528 (1870). 

 Not D. striolatum of Jeffreys, Watson or Sars. Not D. striolatum 

 Risso, 1826. 



More glossy and ivory-like than D. vulgare, usually more dis- 

 tinctly annulated, and with the longitudinal strise completely want- 

 ing except at the smaller end, where their presence is variable. The 

 posterior termination has either a labial projection which is rather 

 broadly fissured dorsally (i. e. upon the arched side of the tube) or 

 if it have not experienced that reparative process is then very taper- 

 ing, and has a short shelving notch-like dorsal fissure; it is always 

 entire upon the ventral or incurved side of the shell. In certain 

 specimens the close approximation of the concentric lines of growth 

 produces a somewhat annulated appearance. (F. & H.). 



D. entalis is an abundant species on the coast of Maine ; and 

 William Stimpson, comparing with the European D. vulgare and 

 finding differences, distinguished the American shells as D. striolatum. 



