106 DENTALIUM-L^VIDENTALIUM. 



Deshayes, an internal groove ending in a slight notch). Length 33, 

 diam. 3'5 mill. 



Mediterranean Sea, coasts of Italy, Sicily and Tunis, 2-40 fms. ; 

 Canary Islands ; Pliocene of Sicily. 



D. rubescens DESH., Mem. Soc. Hist. Nat. Paris, ii, p. 363, pi. 16, f. 

 23-25 (1825). PHIL., Enum. Moll.Sicil., i, p. 244 (1836) and ii, p. 

 206 (1844). ARADAS, Conch. Mar. della Sicil., p. 117 (1870). 

 ORB., Moll. Canaries, Brit. Mus. Catal., p. 28 (1854). DAUTZEN- 

 BERG, Mem. Soc. Zool. France, iv, p. 609. SOWB., Thes. Conch., 

 iii, pi. 224, f. 39. JEFFREYS, P. Z. S., 1882, p. 660. PHIL., Enum., 

 i, p. 244; ii, p. 2QQ.D.fissura PHIL., Enum. Moll. Sicil., i, p. 244. 

 Not of Lamarck. D. rufescens WEINKAUFF, Conchyl. Mittelm., ii, 

 p. 420. CLESSIN, Conchyl. Cab., p. 8, pi. 3, fig. 7 (bad). Pseudan- 

 talis rubescens MONTS., Nom. Gen. e Spec. Conch. Medit., p. 32. 



The specimen before us has the apical features described above, 

 but, according to Jeffreys, there is in perfect specimens " a small ter- 

 minal pipe or sheath which is partly enclosed in the shell, but pro- 

 trudes from it as in D. entalis and many other species ; it is slightly 

 channelled on each side. McAndrew noticed a white variety from 

 Goletta near Tunis." 



Varieties pallida and albina are mentioned by Monterosato. 



Weinkauff changed the name to "rufescens" probably inadvert- 

 ently ; and Clessin, who appears to take all his synonymy at second 

 hand, perpetuates the blunder, and wrongly quotes Philippi and 

 others as using that incorrect name. He likewise places D.filum as 

 a synonym of "rufescens" and admits it as a distinct species, on one 

 and the same page of his unspeakable monograph. 



Var. ? TENUIFISSUM Monts. PL 19, figs. 16, 17. 



Monterosato proposes the name tenuifissa for examples with a slit. 

 The latter occur in the same localities with the unslit typical forms. 



Deshayes also, in his ms. card catalogue, distinguishes this varia- 

 tion under the new name D. discretum. 



Naples (Phil.) to Sicily (Phil., Monts.). 



D.fissura PHIL., Enum. Moll. Sicil., i, p. 244 ; ii, p. 206. COSTA, 

 Fauna Reg. Nap., Tubibranchi, p. 25, pi. 3, f. 6. Not of Lamarck. 

 Pseudantalis tenuifissa MONTS., Nom. Gen. e Spec. Conch. Medit., p. 

 33 (1884). D. discretum DESH., Mss. D. splendens COSTA, Cata- 

 logo ragionato, p. 125. 



