DENTALIUM. 195 



W fcjz 2. D. TARENTI'NUM *, Lamarck. jy{ . s~<r 



Z>. tarentinum, Lam. An. sans Vert. v. p. 345. J5. Tarentinum, F. & H. 

 ii. p. 451, pi. Ivii. f. 12. 



BODY yellowish-white : tentacles very long, ringed like worms, 

 with sucker- shaped tips : palps usually eight in number, four 

 on each side of the mouth, but difficult to make out ; they are 

 of different sizes, and covered with vibratile cilia : foot flanked 

 on either side by a sinuated symmetrical lobe or flap. 



SHELL less slender and rather more curved than D. entails, 

 not so apt to be segmented, very solid and opaque, mostly dull 

 and lustreless : sculpture, fine and regular longitudinal stride 

 towards the point; and the entire surface appears, under a good 

 magnifying power, covered with extremely numerous and de- 

 licate impressed lines in the same direction ; there are also 

 the usual marks of growth : colour creamy, with sometimes a 

 reddish-brown tinge, or clouded rings denoting the periodical 

 lines of growth, and occasionally a pinkish hue near the point : 

 margin at the anterior end jagged, as in the other species ; at 

 the posterior end it is abruptly truncated, and furnished with 

 a very short and small straight pipe, placed in the middle and 

 having a circular orifice; it has no notch, groove, slit, or 

 channel. L. 1-3. B. 0-2. 



HABITAT : From low-water mark at spring tides 

 (Oxwich Bay, near Swansea, J. G. J.) to 25 f., in the 

 Channel Isles, South of England, Bristol Channel, Car- 

 digan Bay (J. G. J.), Bantry Bay (Mrs. Puxley and 

 J. D. Humphreys), and Arranlsle, co. Galway (Barlee). 

 At the latter place it was dredged with D. entails, but 

 in a larger numerical proportion. Fossil in the Sub- 

 apennine tertiaries (Brocchi), and Sicily (Philippi, as 

 D. entails) . The present species has a southern range 

 from the north of France to Gibraltar, both sides of the 

 Mediterranean, and the Adriatic, in 3-40 f. It has 

 usually been regarded as D. entails. 



* From its having been found at Tarento, in Italy. 



K2 



