n F. N T A L I U M. 



1. 



Genus DKXTALIUM, Linnti>us. 

 Testa elongata, tuh(i'J'ormi.<, (in-imld, li'ind. s/ihri/is : 



apice perforaU) ; api-rtnni .tiiii/>/ici, niliiiidi'i. 

 Shell elongated, tube-sliaped, archi'd. not sjand ; apex 

 perforated; aperture simple, rouiuled. 



In an analogical point of view a Dentnliina should 

 bo regarded as a Fissure/la with the apex very much 

 raised and extended, with a similar perforation at the 

 end. And as in that genus there is not onl_v the round 

 perforation, but generally a slit on each side of it, so 

 as to foim the "key-hole," as it is called, so in many 

 instances there is a little fissure on the dorsal, rarely 

 on the ventral side of the apical ])erforation in Diii- 

 tnlium. The presence or absence of such fissure 

 cannot be sufficient to found a generic distinction upon, 

 since it varies iu length and position, or may be present 

 or absent in individuals of the same species. The genus 

 EntaLIS, therefore, of some authors is included in the 

 following monograph. 



The geographical distrlhuti.m ,,f the various species 

 of tlie genus is extremely widi-. \\\- have two l^ritish, 

 many Indian, and several Auslnilian and American 

 spech-s. Many fine sorts were coIK-ct.a by Mr. Cuming 

 in the Philippines. Since Mr. SowerI)V -s monogra]>h 

 in the Thesaurus, a few interesting species have bei-n 

 described l)y Mr. Gould, raising the present recorded 

 number to fifty-five. 



Species L'. (Kig. -^ A, Mus. P.rit.) 



DkXTAI, li;.M AIRINUM. Jkll. Il'sir, ,l<>,„litl,K IIIKJIISI 

 Viilidc niTiiatii, li-iilr rrrsrnili, virUli f,isei„ti 

 pictd, costis circa tlereiit (inintt,), mlirstilns /i/miis 

 apice inte</ro ; aperiuni atii/aliit<i. 



ThK BoAR's-TUSK DliNTAMfM. Shell el.illL'a ted, nn\Vn\ 



Strongly curved, slowly increasing, paiut.d i 

 bands' with green, strcnL'thened with about ten rib 

 interstices Hat ; aperture .-uiLMilar. 



LlNX.El'.S. Systema \atur;<'. 



Ilab. St. Nicholas, Islan.l ol Zebu, Philippines. 



Species 1. (Mus. Cum. in P.rit.) 



I)i;.NTAi,lUM Bi^LClimi. l>,'ii. t,.<l,; allmla, ..(,•?£ rnhni, 

 breviusculd, valide araiatd, lent!- cresci'iiti, solidii, 

 costis crchris, inigosls, ipia.fi ariiadatls lirahi ; 

 apice tnincato, integru. 



Belcher's Dektalium. Shell whiti;-h, or red, rather 

 short, strongly curved, slowly increasing, solid, 

 ridged with close, rough, ipiasi articulated rilis; 

 ape.x truncated, entire. 



SoWERiiY. Thesaurus Conchyliorum, Dentalium, Sp. 

 27, f. 28, 29. 



Iluh. East Indian Archipelago. 



Novem 



Species I!. (Mns. M;ie Andrew. ) 

 Dentalium Vic];nei.ii. Ih'u. t<^i>i „>,i:/w}, judHdr jiilr,} 



fusro-ruln'^rnitl la,,i„l,i. ,; ,1,„sriil,l laniil, r Mriata 

 lente ens,: mi : Ji.sun) ,,j,i.;,l, ln,rii!r..;,l,i. 



VEIiNEI.l's I)l.:xiAl,iiM. Shell large, pale fnlv,,us 

 banded with a reddish-brown, finely striaful 

 rather straight, slowly increasing : ajucal rissun 

 rather long. 



IIanlev. Sowerbv"s Thesaurus t'uiicliylionim. Hen 



taliun 

 Hab. Jai 



Species 4. (Mus. 15rit.) 

 iectum. Ih-it. iPflii crass,}, inaijua, 

 ,„l,„rc„al.;, pallida, /,f/ra:iildaU. snb- 



dowja 



The .sTl:Air;nT Dextai.iu.m. Shell tluek, large, 

 curved a little backwards, pale pyramidal, sub- 

 acuminated, broad at the margin of the aperture, 

 ribs numerous, unequal, rough ; apical fissure 

 long. 



Gmelin. In ed. Linn. Syst. Nat. 



Dentalium elephaiitininn, Deshaycs, not Linn. 



Lhntalium stiiatnia, Martini. 



Hah. Adriatic Sea. 



