43 



Nerttella puella. T. parva, oblique ovata ad ventrem 

 plaiiulata, lawis, viridescens, lineis angulatis fuscis et interdum 

 fasciis articulatis ornata ; anfr. 3, ultimo amplo. Apertura parva, 

 labro producto, columella callo copioso induta, minutissime dentic- 

 ulata. Lat. max. 7, min. 5 millira. 



Inhabits Loo Choo. W. S. 



Nearly of the shape and size of iV^. viridis, the spire, being less 

 prominent, and the aperture smaller. 



Neritella (Clithon) penicillata. T. ovato-globosa, obli- 

 qua, laevis, vh-idis lineolis luteis undulatis obliquis ubique ornata ; 

 anfr. 3-j- ad trientem posteriorem angulo mstructis spinas tenues 

 tubulosas ad sex armato. Apertura arapla, labro producto acuto, 

 labio simplici, lutescente ; fauce coerulescente. Axis y^ ; diam. 

 2- poll. 



Inhabits New Ireland. Lieut. Van Wycke. 



Distinguished from most spinous species by its smooth surface, 

 and from all by its delicate lineations. 



Nerita pica. T. parva, tenuis, oblique ovato-globosa, rudis 

 anthracina maculis parvis raultiformibus albis ornata. Spira baud 

 elevata. Apertura semicircularis, labro simplici nigro marginata ; 

 columella excavata, nitida, flavescente, edentata. Operculum 

 virescens, granulatum. Axis -^^ ; diam. J- poll. 



Inhabits Simoda, very common on rocks. 



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 

 ly^fy ; diam 1-^^ poll. 



Inhabits Hakodadi Bay. W. S. 



From its form and exterior it might be taken for N. h'eros, but 

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



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

 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. 



