98 Mi NT A LIU M. 



4. D. rubescens, Des/i., f. 39. — Testa laevi, rubescente, fasciis 

 rubris transversis variegate, gradatim crescente, leviter arcuata, vix 

 fissurata. — A smooth shell, of rather interrupted growth, of a red 

 colour, with darkish bands. 



5. T). nebulosum, Desk., f. 58. — Testa polita, angusta, tniui, 

 alba, fasciis acute angulatis pellucidis versus apicein variegata; 

 fissura apicali laterali.- — Besides the zigzag pellucid markings 

 near the small end of the shell, M. Deshayes has pointed out 

 that the fissure is not dorsal, but lateral, in position. This, how- 

 ever, is possibly accidental. 



6. D. lacteum, Desk., f. 48. — Testa laevi, polita, tenui, lactea, 

 angusta, apice integro. — Smooth, thin, narrow, and milky-white. 

 No fissure. 



7. D. translucidum, Ded., f. 47. — Testa hyalina, subaureo- 

 fiavescente, polita, tenui, subcylindrica, leviter arcuata, apice ob- 

 tuso ; fissura plus minusve elongata. — Of a transparent amber-co- 

 lour. The slit, which is a mere linear crack, is in some instances 

 lengthened indefinitely. 



8. D. splendidum, Sowh., f. 41. — Testa polita, versus apicem 

 attenuata, carnea, deinde lactea, ad apicem fissuris duabus, altera 

 dorsali, altera ventrali. — Generally reddish near the apex and white 

 towards the base. In some specimens there are two fissures, one 

 dorsal and the other ventral. 



9. D. fissura, Land:, f. 43. — Testa polita, rubescente vel fia- 

 vida, gracili, subpellucida ; fissura dorsali nonnunquam elongata, 

 nonnunquam fissura brevi ventrali. — This shell agrees better with 

 Lamarck s description than the fossil figured in the genera. It is 

 more gracefully tapering and less transparent than D. transluci- 

 dum. 



10. D. longitrorsum, Rve., f. 59, 60. — Testa polita, subaureo- 

 flavescente, elongata, valide arcuata, fissura dorsali brevissima. — 

 A large, elongated, strongly bent, amber-coloured shell, with very 

 slight dorsal fissure. 



11. D. eburneum, Linn., f. 53. — Testa polita, pallide fulva, 

 elongata, rectiuscula, annulis concentricis clevatis numerosis cinc- 

 ta ; apice attenuata, vix fissurata. — The name has been wrongly 

 applied to the species with incised lines, which Linnaeus described 

 under the name of D. poli/um. T. eburneum is distinguished by 

 raised rings of circumference. 



12. D. Phiijppinarum, Smcb. Th., f. 54.- — Testa quam D. 

 ehtrneo angustiorc, magis diaphana, colore rubescente. — This is a 



