DENTALIUM.— Plate VII. 



Like DentaUum translucidum, but hyaline white. 

 The dorsal fissure, although rather long, is not nearly 

 so long as in that species. DentaUum lacteum, which 

 would otherwise pass for the present species, is not 

 fissured. In DentaUum Uihricatwm also the apex is 

 entire. 



Species 50. (Mus. Brit.) 

 Dentalium buccinulum. Den. testd albidd, graeiUimd, 



rectifisculA, lente cvescenti, submquaUter longitudi- 



iiaUte.r striata ; apice integro. 

 The little tuumpet Dentalium. Shell white, very 



narrow, rather straight, slowly increasing, rather 



equally longitudinally striated ; apex entire. 



Gould ? MS. in Brit. Mus. 



Ifnb. Hong Kong. 



Species .51. (Mus. Cuming in Brit.) 



Dentalium inversuii. Den. testa teniii, graciU, 

 Icevigatd, moderate arcuatd, gradatim crescenti, 

 2)rope apicem rubra, versus marginem apertura 

 albi'i ; apice attenuato, acuminato, ad laterem veu- 

 tralem jissura longiiisculd inciso. 



The inverse Dentalium. Shell thin, slender, smooth, 

 moderately arched, gradually increased, red near 

 the apex, white towards the margin of the aper- 

 ture; apex attenuated, acuminated, incised with a 

 rather long fissure on the ventral side. 



Deshayes. Sowerby's Thesaiirus Conchyliorum, Den- 

 talium, Sp. 14, f" 4-2. 



H„b. ? 



This species is siiigiilar in possessing a slit on the 



ventral or inner side of the curve. 



Species 52. (Mus. Brit.) 



Dentalium aciculum. Den. testd albd, subnyUndncd, 

 teiiviter annulatd, politd, gradatim crescenti, U-riter 

 cirrnatd, tenui : apice snbtruncato, integro. 



The wheat-ear Dentalium. Shell white,, subcylin- 

 drical, finely annulated, polished, gradunlly in- 

 creasing, slightly arched, thin ; ajiex truncated, 

 entire. 



(i.iULii ? .MS. Brit. Mus. 



Ilah. HoUL' Knll.r. 



The slight sort of annulated structure observable 

 tliis shell gives it a very piretty appearance. 



Species 53. (Mus. Brit.) 



Dentalium nebulosum. Den. testd poUtd, angustd, 

 tenui, albd, vaUde arcuatd, fasciis acute angidatis 

 peUucidis verms apicem variegntd ; Ji,<isurd upicaU 

 laterali. 



The clouded Dentalium. Shell ])olished, narrow, thin, 

 white, strongly arched, variegated near the apex 

 with acutely angular pellucid bands; apical fissure 

 lateral. 



Deshayes. Monograph of Dentalium. 



Hab. Indian Seas. 



The incision of the apex in this species is lateral 



instead of dorsal as usual, or ventral as in DentaUvm 



inversinn. 



Species 54. (Mus. Brit.) 



Dentalium pretiosusi. Den. testd albd. soUdd, Icevigatd, 

 leviter arcuatd, gradatim crescenti, prope apicem 

 rubra, angustiuscidd ; Jissnrd apicaU parvd. 



The precious Dentalium. Shell white, solid, smooth, 

 slightly arched, gradually increased, red near the 

 apex, rather narrow, ajiical fissure small. 



NUTTALL. IMS. 



Dentalium strialatum, Stinipson. 

 Hab. Slassachusetts ; California, ifec. 



It is of slower increase in circumference, less curved 

 and more cylindrical than Dentalium entale. 



Species 55. (Mus. Brit.) 

 Dentalium lubuicatum. Den testd elongatd, 

 rectiusculd, angustd, tenuiusculd, Icevigatd, 

 crescenti; apice integro. 

 The lubricated Dentaliusi. Shell elongated, 

 rather straight, narrow, rather thin, smooth, 

 increasing; apex entire. 

 SowERBY. Thesaurus Conchyliorum, Dentalium, 



f. 5G. 

 Hab. Australia. 



A larger shell tlian D, iitalium jiretiosum or D. 

 narrower, more cylindrical than either of them. 



albd, 

 lente 



slowly 



