DENTALIUM. 99 



brightly coloured, transparent shell, much narrower in proportion 

 than D. eburneum. 



13. D. erectum, Sowb. TJi., f. 55. — Testa polita, angusta, vix 

 arcuata, medio et versus apicem rubescente, prope marginem alba, 

 utraque iissurata. — This tapering shell is very little curved, the 

 narrow end is strongly coloured, the larger end white. There is 

 a slit on each side of the apex. 



14. D. inveesdm, Desk., f. 42. — Testa tenui, laevi, angusta, 

 leviter arcuata, ad apicem rubescente ; fissura apicali ventrali. — 

 The shell is narrower than D. spleudidum , but similarly coloured. 

 It has a fissure on the inner or ventral side of the apex. 



15. D. attenuatum, Sowb. Thes., f. 40. — Testa tenui, fulva, 

 polita, paululum arcuata, quam praecedentes angustiore ; apice vix 

 emarginata. — A shining, pointed, very narrow species, with a very 

 slight notch at the apex. It is nearly straight. 



16. D. fistula, Sowb. Thes., f. 62. — Testa subhyalina, an- 

 gusta, recti uscula, apice integro. — The little fossil which M. Des- 

 hayes names D. duplex, is very much like the specimen here 

 figured from Mr. Hanley's collection. Specimens in the British 

 Museum exhibit the character upon which the name is founded, 

 namely, the formation of a second tube where the original apex 

 has been broken off, and Mr. Hanley's specimen shows a second 

 tube formed at the other end. The first being a habit common 

 to many other species, and the second being accidental, I should 

 decline using the name for its inapplicability, even if sure of the 

 identity of the species. 



17. D. filum, Sowb. Thes., f. 45. — Testa tenui, angustissiraa, 

 Isevi, acuminata, pallide fulva, apice integro. — We have specimens 

 of this, dredged by Mr. M'Audrew, at Gibraltar, and others col- 

 lected at the Philippines, by Mr. Cuming. Notwithstanding the 

 difference of locality we can find no characters of specific import- 

 ance by which to distinguish them. They are of thread-like nar- 

 rowness, smooth, and without fissures. 



18. D. sectum, I)esh., f. 35. — Testa angusta, lactea, polita, 

 subrecta, ad apicem oblique secta, prope apicem tenuissime striata. 



— White, cylindrical, polished, nearly straight, with an oblique 

 cut across the apex, on the dorsal side. 



19. D. politum, Linn., f. 46. — Testa polita, leviter arcuata, 

 pallide fulva, angusta, gradatim crescente, striis incisis obliquis 

 numerosis concentricis cincta ; fissura apicali elongata. — Mr. 



Hanley, in his ' Ipsa Linnrei Couchylia,' has rectified the long- 



