108 



convexiusculis, posticis attenuates, ad suturam raaculis fuscis saepe 

 ornatis. Apertura anguste ovalis, vix efFusa ; fauce livida. 

 Long. 1 ; lat. £ poll. 



Inhabits Taheiti, common in streams. 



Belongs to the peculiar subulate group of Polynesia ; peculiar 

 by its grooves and the dots near the suture. 



Melania dolorosa. T. elongata, solida, laevis vel striis 

 raris cincta, picea ; anfr. 6-f- rotundatis, ultimo bulboso. Aper- 

 tura ovato-rotundata, vix producta ; columella arcuata, lactea ; 

 fauce casrulea. Long, f ; lat. £ poll. 



In streams near Hakodadi. Wright. 



Principally noticeable for its sombre appearance, usually in- 

 crusted by a rusty, felt-like coating, so as to obscure its true 

 surface. 



Neritella puella. T. parva, oblique ovata ad ventrem 

 planulata, laevis, 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 millim. 



Inhabits Loo Choo. W. S. 



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

 prominent, and the aperture smaller. 



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

 qua, laevis, viridis lineolis luteis undulatis obliquis ubique ornata ; 

 anfr. 3-J- ad trientem posteriorem angulo instructis spinas tenues 

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

 labio simplici, lutescente ; fauce casrulescente. Axis -^ ; diam. 



h Polk 



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 multiformibus albis ornata. Spira haud 

 elevata. Apertura semicircularis, labro simplici nigro marginata ; 

 columella excavata, nitida, flavescente, edentata. Operculum 

 virescens, granulatum. Axis -■ 



Inhabits Simoda, very common on rocks. 



