MONOCEROS.— Plate III. 



plants, suboisoletis, undique cincjulatis, interstUiis 

 striatis, lira niinutd labrum verms medio decurrente, 

 columella, wdplicafd, aperturd breviusculd, dente acuta, 

 incurvo; intus extusque alba, liris nigerrimo-fusci^, 

 epiderviide luteo-fuscd indutd. 



The girdled Monocekos. Shell ovate, spke rather 

 prominent, whorls coiicavely depressed round the 

 upper part, girdled throughout wth rather obsolete 

 flattened ridges, interstices striated, with a minute 

 rido-e running through the middle towards the lip ; 

 eolmnella one-plaited ; aperture rather short ; tooth 

 sharp, incurved; white within and without, ridges 

 very dark brown, covered with a yellowish-bromi 

 epidermis. 



Lamarck, Anim. sans vert. (Deshayes' edit.), vol.x. p. 118. 

 Turbinella cingulata, Kiener. 

 Btwcimmi pseuiodon. Burrows. 



Eah. Panama (in clefts of rocks at low water) ; Cuming. 

 Quite inseparable from the present group, although 



distinguished, like TuMnellus, by a winding plait upon the 



columella. 



Species 12. (Mus^ Cuming.) 



Monoceros calcar. Mon. testd suborbiciilari-ovatd, 

 concavo-depressd, spird brevmimd, anfractibus veutri- 

 cosis, liris interstitii^ue densissime imbricato-squa- 

 matis, aperturd ampUter dilatatd, dente loni/issimo, 

 erecto ; ru/escente-fuscd, columelld et apertures fauce 

 albis. 



The spur Monoceros. Shell somewhat orbicularly 

 ovate, concavely depressed, spire rather narrow, ridges 

 and interstices between them very thickly imbricately 

 scaled, aperture largely dilated, tooth very long and 

 erect ; reddish brown, columella and interior of the 

 aperture white. 



Deshayes, Anim. sans vert. vol. x. p. 122. 



Bucdnum calcar, Martyn, Universal Conchology. 



vol. 2. pi. 50. 

 Monoceros breve, Sowerby. 



Hab. Cape Horn. 



This only differs from the M. imbricatum in respect o 

 form ; the scidpture is the same. 



