i 



(') PLATE IV. 



Dentaliuiii interstriatum Sowb. Spec, of Amsterdam Museum. 



Dentalium aprinuni L. Spec, of Amsterdam Museum. 

 — 6. Dentaliiim aprinum var. incolor nov. var. St. 133 and 163. 



Dentaliiun javanum Sowb. Spec, of Amsterdam Museum. 

 — 9. Dentaliiim octangulatiim Don. Spec, of Amsterdam Museum. 

 — II. Deiitalhini ebnrnenin L. Spec, of Amsterdam Museum. 



DentaliuDi eburncnm L. var. Spec, of Amsterdam Museum. 



Detitaliuin eburneiwi L. var. (^= D. novaelioUandiae Chenu), a spec. 

 from the Mus. d'Hist. Nat. of Paris. 

 — 16. Dentalnnii profitndonnii E. A. Smith. St. lii and 10 1. 

 — 18. Dentalitim Sibogae nov. spec. St. 159. 



Dentaliiun ]\Iartensi nov. spec, a much eroded specimen of St. 88. 

 — 21. Dentaliiun seinitracheatiiin nov. spec. St. 248. 



Dentalium tracheatum nov. spec. St. 208. 



Dentaliiim transvcrsostriatiun. St. 2 1 2. 



i) The figures of Plate IV, V, VI are from photographs in natural size. 



