DENTALIUM-ANTALIS. 53 



D. incequicostatum DAUTZENBERG, Mem. Soc. Zool. France, pour 

 1891, p. 53 (footnote) ; Ibid., 1895, p. 370. 



The vicissitudes of nomenclature suffered by this species have been 

 ably elucidated by the learned authors of LesMollusques Marinsdu 

 Rousillon ; and as their material has been so much more extensive 

 than any we have access to, we are content to accept their separation 

 of the form from D. novemcostatum Lam. and D. dentalis Linne. 



D. DENTALIS Linne. PI. 9, figs. 55, 56, 57. 



Shell moderately curved, rather slender ; whitish, zoned and suf- 

 fused toward the smaller end with rose ; sometimes uniform white. 

 Sculpture of about 10 strong rounded ribs near the apex, rapidly in- 

 creasing by the intercalation of intermediate rib lets to 18 or 20 at the 

 aperture. Aperture rounded, polygonal, slightly oblique. Anal 

 orifice small, circular, with very thick walls. No notch or slit. 

 Length 24, diam. of aperture 2'8, of apex 0*8 mill, (or somewhat 

 larger). 



Mediterranean and Adriatic Seas ; Sea of Marmora. 



D. dentalis LINNE, Syst. Nat. (12), p. 1263 (1766). HANLEY, 

 The Shells of Linnaeus, p. 436. O. G. COSTA, Faun. Beg. Nap., 

 Tubibranchi, p. 16, pi. 1, f. 3. MONTS., Norn. Gen. e Spec., p. 31. 

 BUQ., DAUTZ. & DOLLF., Moll. Mar. Roussillon, i, p. 564, pi. 66, f. 

 10, 11. CLESSIN, Conchyl. Cab., p. 6 (in part). STURANY, Ber- 

 ichte der Commiss. fur Erforsch. des Ostlichen Mittelm., p. 120, in 

 Denkschr. K. Akad. Wissensch., Ixii, 1895. DAUTZENBERG, M^m. 

 Soc. Zool. France, iv, p. 609. CARUS, Prodromus Faun. Medit., p. 

 174. D. dentale and D. linnceanum LOCARD, Prodr. Mai. Francaise, 

 in Ann. Soc. d'Agricult., etc. de Lyon (5), ix, for 1886, p. 145 (1887) ; 

 Coq. Mar. France, in Ann. Soc. Linneenne de Lyon, for 1890, p. 

 238 (1891).? D. simile S. BIONDI GIUNTI, Atti Accad. Gioenia de 

 Sci. Nat. (2), xiv, p. 120, pi., f. 6 (1859). D. mutabile DODERL. in 

 Homes, Foss. Moll. Tertiar-Beckens von Wien, in Abhandl. K.-K. 

 Geol. Reichsanst., iii, p. 654, pi. 50, f. 32 (1856). 



Closely allied to D. incequicostatum, with which, indeed, it may 

 have been associated by Linnaeus. Sacco has named " varieties " 

 astensis, sexdecimcostata, quatuordecimcostata, paucicostulata and mac- 

 ulatellata from the Italian Pliocene. It is an interesting collection 

 of Latin compounds, but probably without adequate foundation in 

 nature. 



