DENTALIUM.— Plate V. 



Species 32. (Mus. MacAndrew.) 



Dentalium filum. Den. testa lineari, tenuissima, svh- 

 peliucidd, succined, IcBvtgatd, rectihsculd, latitudine 

 lentissime crescenti ; apice acuniinato, integro. 



The thread Dentalium. Shell linear, very thin, sub- 

 pellucid, amber-coloured, smooth, rather straight, 

 very slowly increasing in width ; apex acimiinated, 

 entire. 



SowERBY. Thesaurus Conchyliorum, Dentalium, Sp. 

 17, f. 45. 



Hah. (4ibraltar, MacAndrnv. Philippines, Cmiiinij. 



ipecii 



(j\Ius. Brit. J 



Species 33. (Mus. Brit.) 



Dkntalium fissuka. Den. testd flavido-ruhescenti, 

 jiolltd, lemii, siibpellucidd, angiisfd, moderate 

 arcuatd ; apice oblique secto, ad marginem, dnr- 

 sakm incisione elongatd, nonnunq%iam ad margiucin 

 ventralem incisione brevifissuratd. 



The fissured Dentaliusi. Shell yellowish-red, 

 polished, thin, rather pellucid, narrow, moderately 

 curved ; open, obliquely cut, fissured with an 

 elongated slit on tlie dorsal margin, sometimes 

 with a short slit on the ventral margin. 



Lamarck. Animaux sans vertebres. 



Hah. Indian Seas. 



Species S4. (Mus. Brit.) 



Dentali-um liuatum. Den. testd alba, parvd, redd, 

 aiigustd, cylindraced, costis longitudinalibus rotiin- 

 datis cBqvalibus circa duodedm liratd. 



The lute-.strixged Dentalium. Shell white, small, 

 straight, narrow, cylindrical, ridged with about 

 twelve longitudinal, rounded, equal ribs. 



Carpenter. Shells of Mazatlan. 



Hab. Mazatlan, United States. 



Dentalium (juinquangulatum. Den. testd alhd, parvd, 

 actiminatd, prvpe apicem valide arcuatd, rapide 

 crescenti, costis angulatis quinque sculptd, margine 

 aperturcB perobliquo, latere ventrali producto ; apice 

 acuto, integro. 



The five-angled Dentalium. Shell white, small, 

 acuminated, strongly arched near the apex, 

 rapidly increasing, sculptured with five angular 

 ribs, margin of the aperture very oblique, pro- 

 duced on the ventral side ; apex acute, entire. 



Forbes. Report on the ^Egean Sea. 



Hab. ^Egean Sea. 



Remarkable for the strong curve near the apex, and 

 for the peculiarly oblique elongated margin of the 

 aperture. 



aecies 36. (Mu 



Jrit.) 



Dentalium lobatum. Ben. testd hreci, valide arcuatd, 

 curtd, latd, Icevi, alhd, vel partim colcrribus pallidis 

 variegatd ; apice obtuso, truncato, in lobis qiiatuor 

 diciso. 



The lobed Dentalium. Shell short, strongly arched, 

 short, broad, smooth, white or partly variegated 

 with pale colours ; ajjex obtuse, truncated, divided 

 into four lobes. 



SowERBY. Thesaurus Conchyliorum, Dentalium, Sp. 

 ■UK f. U. 



Hab. .' 



The habitat of this curious species is not known. 

 Of the four lobes, into which the apical margin is 

 divided, the ventral and dorsal ones are slightly 

 fissured. 



