DENTALIUM.— Plate IV. 



Species 2-i. (Mus. Brit.) 



Dentalium liUBEscENs. Den. testa soliil'i, laviijatd, 

 angustd, rubescenti, /asms rubris transversalibus 

 annulatd, gradatim cregcenti, rectiusculd ; apice 

 intcijro. 



The reddish Dentalium. Shell solid, smooth, narrow, 

 reddish, ringed with transverse red bands; gra- 

 dually increasing, rather straight; apex entire. 



Deshayes. Monograph of Dentalium. 



Ilah. .Mediterranean. 



Species 25. (Mus. Cum. in Brit.) 

 Dentalium dispak. Den. testa albd, semipelbicidd 

 politd, 'jmdatim crescenti, moderate arcuatd, ad 

 apir.em quadrangidatd, versibs medium angulis costce- 

 formibtis interstriatis, deinde usque ad marginem ro- 

 tiDuld, politd hatid striata ; apice integro. 

 The dissimilar Dentalium. Shell white, semipellucid, 

 polished, gradually increasing, moderately curved, 

 quadrangular at the apex, the angles interstriated 

 towards the middle, thence to the margin rounded, 

 polished, and without stria; ; apex entire. 

 Sowei'.bt. Thesaurus Conchyliorum, Dentalium, Sp. 47, 



Hah. Isl. Samar, Pli 



This shell has three distinct characters in its length. 

 At the ape.x it is four-sided, each angle forming a rib ; 

 then there appears a small stria between the angles ; 

 and then from the centre to the margin ribs and strite 

 disajipear, leaving a smooth rounded circumference. 



Species 2tj. (Mus. Cum. in Brit.) 



Dentalium vamabile. Den. testa tuihi-iilinilr-ared, 

 ciassd, angustd, albidd, lent'e cre.icenti, rectiiisculd, 

 costis subroiiindis, maculatis quasi-ai-ticulatis, 

 versus apiceni paueis, medio et infra magis nume- 

 rous sculptd. 



The variable Dentalium. Shell subcylindrical, thick, 

 narrow, whitish, slowly increasing, rather straight, 

 sculptured with rounded ribs, few towards the 

 apex, more numerous in the centre and towards 

 the apex. 



Deshayes. Monograph of Dentalium. 



Dentalium eburneum, Turton (var. ). 



Dentalium album, Turton (var.). 



Hab. Philippines. 



The variabilities of this species depend upon the 

 number of ribs into which the few at the apex multiply 

 towards the middle and base. 



