D L I U M 



Species 11. (JIus. Curaiug.) 



DoLlUM FASCIATDM. Dot. teHd ovato-ventricosa, vu 

 umbilicatd, sinrci caiialiculafd, aiifractihis sex ad 

 septeni, tranimersim costatis, costis sedecim ad septem- 

 decim, plano-convexis, Imvibus, inierstitw supremd lall- 

 mcnld, columella subcontorld, lahro refiexo,fimhriato- 

 dentato ; alhd, faseiis quatuor latinscuUs aurautio- 

 fmck, pone labrum evanidis, cingidatd, apice c<eruleo- 

 aigricanle. 



The banded Tun. Shell ovately ventricose, scarcely 

 umbiEeated, clianneUed at the spke, whorls six to 

 seven in number, transversely ribbed, ribs sixteen to 

 seventeen, flatly convex, smootb, uppermost interstice 

 rather vride, columella a little twisted, lip reflected, 

 fimbriately toothed ; white, encircled with four rather 

 broad orange-brown bands, fading behind the Up, 

 apex blue-black. 



Lamarck, Anim. sans vert. vol. x. p. 142. 

 Biicciimm faxciatiim, Briiguiere. 



Hah. Philippine Islands ; Cuming. 



The orange-browu bands wliich encircle this shell con- 

 stitute a marked character of the species, whQst the manner 

 in wbich they gradually fade away before reaching the lip, 

 neatly illustrates a peculiarity which may be observed 

 thj-oughout the species, of a certain deficiency of pattern 

 towai-ds the completion of tlie shell. Before arriving at 

 maturity, the animal appears to lose its powers of design 

 in the display of ornamental colouring, and it not unfre- 

 quently happens, that after any sudden accident or concus- 

 sion, sufficient to cause a sea-break, the shell is completed 

 in a coarse rugged manner, with little indication of the 

 design and variety of colouriug which has characterized 

 its previous growth. 



It is hardly necessary to di'aw a comparison between 

 this species and the D. costatum, confounded wth it by 

 M. Kieuer, for the ribs in that species are very prominent, 



and widely separated, whilst in the B.fmcialum they 

 are very depressed and almost contiguous; the bands, 

 moreover, wanting in I), costatum, are not to be lightly 

 rearardcd. 



Species 12. (Tig. a, Mus. Hanley ; Fig. b, Mus. Cuming.) 

 DoLiUM zonatum. Bol. testa globoso-ovatd, termiculd, 

 vi.i- nmbilicatd, spires sutwris canalicidatis, avfractibus 

 sex, transversim costatis, costis depresso-convexis, qua- 

 tnordechu ad sedecim, subdistantihis, lira tenui, stcperne 

 dnabns tribusve, interveniente ; columella tortuosd, lahro 

 simpUci aut stibtiliter cremlato ; castaneo-rufescente, 

 concolori, anfractunm parte supremd albidd, apice 

 nigricante. 

 The zoned Tun. Shell globosely ovate, rather thin, 

 scarcely umbilicated, sutures of the spire channelled, 

 whorls sLx in number, transversely ribbed, ribs de- 

 pressly convex, fourteen to sixteen in number, ratlier 

 distant, with a fine ridge, two or three towards the 

 upper part, rimning between them ; columella 

 twisted, lip simple or finely cremdated ; chesnut-red, 

 of one uniform colour, uppermost portion of the 

 whorls whitish, apex blackish. 

 Green, Transactions of the Albany Institute, vol. i. part 1. 

 p. 131. 



Bolinm crenulatnm, Philippi. 

 Eab. China. 



This is the only species of the genus in which there is 

 an isolated raised line between the interstices of the lower 

 ribs of the shell ; the D. galea has an elevated line between 

 the upper ribs in an early stage of growth, but in this 

 portion of the shell of D. zonatum, there are thi-ee. It is 

 accurately described and figm-ed by Dr. Jacob Green of 

 the United States in the vohmie above referred to, and a 

 magnificent specimen has been recently described and 

 figured by Dr. Phibppi in the thii'd volume of his ' Abbil- 

 dungen ' as a new species with the name above recorded. 



January, Isi'J. 



