42 



angulato. Apertura rotundato-ovata, peritremate continuo, vix 

 incrassato. Alt. -^-^ ; diam. ^^^^j poll. 



Loo Choo Is. W. S. 



Paler and less solid than any other described species ; more 

 elongated than the following, and diflfering in color. 



AssiMiNEA RUBiDA. T. ovato-conica, solida, impolita, stra- 

 minea aurantiaco tincta, perforata ; anfr. 6 rotundatis, sutura 

 profunda. Apertura parvula, pjriformis, peritremate continuo. 

 Alt. £-^ ; diam. ^-^ poll. 



Inhabits Loo Choo, on beaches. W. S. 



Rather smaller than the preceding, and distinguished by its 

 color and solidity. 



Melania libertina. T. elongata, turrita, truncata, luteo- 

 cornea, hie illic fuscata, lineis volventibus antice insculpta ; anfr. 

 5-|- convexiusculis. Apertura elongata tortuosa, labro albo pos- 

 tice sinuato, antice in canalem obtusam producto ; fauce livida. 

 Long. 1|- ; lat. J- poll. 



Simoda and Ousima, in sluggish streams and ditches. W. S. 



Generally resembles M. Virgi7iica and indefinitely Lea, which 

 has a more lax and elongated spire. The grooving varies, and 

 in some specimens is nearly wanting. 



Melania gracilina. T. subulata, truncata, imperforata, 

 tenuis, Ijevis, olivacea, sulcis acutis remotis cincta; anfr. 7-(- 

 convexiusculis, posticis attenuatis, ad suturam maculis 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, Irevis vel striis 

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

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

 fauce cserulea. 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. 



