SPURIOUS SCAPHOPODA : SERPULID.E. 241 



Denialium cornieulum Costn, Fauna Reg. Nap., Tubibranclii, 

 Appendix, p. 55, pi. 4, f. 2. Belongs to Ccecidce. 



Dentalium cmctvm Koninck, 1843. Descr. Aniui, Foss. Terrain. 

 Belgique, p. 318, pi. 23, fig. S.= Orthoceras suhcentrale Koninck, p. 

 514, pi. 44, fig. 3. Carboniferous, Belgium. 



Coleolus creuatocinctus Hall, 1879. Pal. N. Y. v, pt. 2, p. 188, 

 pi. 32, f. 1-3 ; pi. 32a, f. 3, 4. Considered a Dentalium by Whit- 

 field. 



Dentalium glabrum Montagu, 1803. Test. Brit., }). A%l.= C(ecum 

 glahrum (Montagu). 



Dentalium imperf or atum Montagu, Test. Brit., i). 496. ^^Cceeum. 



Dentalium imperforatum Turton, Conch. Diet. Brit. Is., p. 39, 1819 

 (Walker Test, minuta rariora, etc., p. 4, pi. 1, f. 15).= Ccecum. 



Dentalium intestiniforme Jj'inn.^^ Thy lacodes polyphragma Sassi 

 (Morch, P. Z. S., 1862, p. 66). 



Dentalium jungii d'Orbigny, 1852. Prodr. Paleont. Strat., Vol. 

 iii, index, p. 59. ^Fusus jungii, a mistake in indexing. 



Dentalium pygmceus Defrance, 1819. Diet. Sci. Nat., Vol. xiii, 

 p. 71.= Ccecwn. 



Dentalium spinulosum Miller, M^S.=IIamites sjnnulosus Sovvb., 

 Min. Conch., iii, p. 29, pi. 246, f. 1 (1821). 



Dentalium trachea Montagu, Test. Brit., p. 497, pi. 14, f. 10.= 

 Caecum. 



2. Vermes of the Family Serpulidce. 

 Genus Ditrupa Berkeley, 1834. 



Zoological Journal, v, p. 426. 



Worms of this genus form a calcareous shell shaped like a Den- 

 talium or a narrow Cadulus (such as C. acus or panamensis), gener- 

 ally constricted anteriorly or with swollen rings or constrictions at 

 irregular intervals along the tube, which is very earthy and brittle. 



Various species have been described as Dentalium, such as D. 

 strangulatum Desh., D. subulafum Dh. (pi. 37, fig. 16), D. arietinum, 

 Miiller (pi. 37, fig. 19), and D. goreensis Clessin (pi. 37, fig. 17). 

 Forms a good deal like D. subulatum occur in the West Indies, and 

 there is a multi-annulate East Indian species. They probably occur 

 in most seas. The irregularity and earthy texture of the tube are 

 generally sufficiently conspicuous to prevent any confusion with 

 Scaphopod shells. Some related genera of Serpulidce have more or 

 less similar shells ; but the generic and specific characters of these 

 16 



