105 



The preceding three species form a peculiar group near to 

 Cyclostoma proper, characterized by the thin paucispiral opercle 

 with thin edges, the globose conic form, free umbilicus, nearly 

 circular peristome which barely touches the preceding whorl, and 

 the projecting lamellar striae of growth decussating with revolving 

 ridges, in some cases furnished with epidermal barbs. It may be 

 called Japonia. 



Helicina verecunda. T. pyramidato-lenticularis, spiraliter 

 minutissime striata, luteo-virens ad apicem rubescens, ad peri- 

 pheriam subangulata, subtus convexa, admodum callosa; anfr. 

 4 planulatis. Apertura ovata-triangularis ; peristomate evaso, 

 albido, ad columellam rectam angulariter juncto. 



Axis f ; diam. £ inch. Inhabits Loo Choo. 

 , Belongs to the group of which H. striatula is a type. 



Succinea ltrata. T. ovata, solidula, luteo-virens, unda- 

 tellis flexuosis lyrata ; anfr. tribus ventricosis, apice obtuso. 

 Apertura ovata, columella vix flexuosa callo perexiguo induta. 

 Axis ^ ; diam. £ poll. 



Near the sea-shore, Loo Choo. W. S. 



A small ovate species, quite remarkable for its lyrate surface. 



Auricula (Leuconia, Gray) opportuna. T. parva, ellip- 

 soidea, solida, livido-albida, lasvis ; anfr. 6 ad suturam imbricato- 

 appressis. Apertura falcata, postice acutissima, antice rotundata ; 

 labio lamella compressa elevata mediana et lamella duplici anti- 

 cali obliqua instructo ; labro simplici. Long. 8 millim. ; diam. 

 4 millim. 



Inhabits Loo Choo Is. W. S. 



Omphalotropis strictus. T. elongata, ovato-conica, solid- 

 ula, lsevis, arete umbilicata ; anfr. 6 rotundatis ad suturam tabu- 

 latis. Apertura ovata, peritremate simplici continuo, sed postice 

 ad ventrem retracto ; umbilico carina inconspicua approximate 

 cincto. Axis -*■ ; diam. £ poll. 



On old stone walls, Loo Choo. W. S. 



One of the smallest species yet described, with a very small 

 perforation, and a faint keel around it at a very short distance. 



Limn^ea ollula. T. parva, tenuis, ovata, viridi-cornea, im- 

 polita ; anfr. 4+, ultimo ventricoso. Apertura rotundato-ovata ; 

 14 



