109 



A small, prettily marked species, remarkable for its destitution 

 of grooves, granules, folds, and denticles. 



Natica severa. T. ovato-globosa, solida, impolita, rufo- 

 cinerea ; anfr. 4 ventricosis postice quadratis, apice fusco. Aper- 

 tura ovata, labro postice tenui, antice sensim incrassato, ad colu- 

 mellam rotundato ; umbilico magno, clavo fere impleto. Axis 

 1 T % ; diam 1-& poll. 



Inhabits Hakodadi Bay. W. S. 



From its form and exterior it might be taken for N. heros, but 

 it has a very different umbilicus, resembling JV. unifasciata. 



Natica russa. T. imperforata, ovato-globosa, tenuis, laevis, 

 epidermide tenui cerina induta ; anfr. 4 ventricosis postice quad- 

 ratis. ' Apertura ovata, subeffusa, labro tenui, umbilico callo com- 

 presso albo obstructo. Operculum osseum. Axis 18 millim. ; 

 diam. 16 millim. 



Arctic Ocean. W. S. 



Like N. claasa, but larger, the whorls more broadly shoul- 

 dered, the umbilical region more concave and more perfectly 

 closed by callus than in any shell of that species I have seen. 



Natica puerilis. T. parva, ovata, solida, polita, epider- 

 mide tenuissima straminea induta ; anfr. 4 tribus apicalibus par- 

 vis eburnatis ; sutura obscura ; facie ventrali planulata umbilico 

 semicirculari perforata plerumque callo impleto. Apertura semi- 

 ovalis, postice rotundata ; labro acuto. Operculum corneum ru- 

 bidum. Axis £ ; diam. f poll. 



Inhabits Porto Praya. W. S. 



Eesembles JV. glabella and JV. nitida. It is, however, more 

 elongated, and less flattened on the face. 



Gena dilecta. T. parva, tenuis, elongato-ovalis, nitida, 

 luteo-virens maculis albis trigonis nigro apicatis interdum serial- 

 ibus ornata, striis incrementi et striis spiralibus profundioribus 

 decussata ; anfr. 3, apice fere terminali. Apertura angusta, ova- 

 lis faciem ventralem fere adequans ; intus nitide virescens. 

 Long. 8 millim. ; lat. 4 millim. 



Inhabits Hakodadi Bay, on shells, &c. W. S. 



Very delicate and slender, allied to G. planulata, a much 



