15 



apertura e tribus duas partes faciei ventralis amplectente. Long- 10 ; 

 lat. 7 ; alt. 2 millim. Taken with the animal in the North China 

 Seas. W. S. 



Margarita ianthina. T. globoso-conica, tenuis, dilute ianthina, 

 striis crebris volventibus cincta, satis umbillcata, ad peripheriam sub- 

 angulata ; anfr. 6 -f- ventrieosis ; sutura profunda : apertura rotun- 

 data, antice subangulata ; columella recta, acuta ; fauce margaritacea. 

 Axis, 8 ; diam. 20 millim. Inhabits Arctic Ocean. 



Similar in form and size to L. Schantai'tca, Midd., but thinner, more 

 angular, differently colored, and with a much larger umbilicus. 



Margarita musiva. T. pj-ramidalis, margaritacea, crusta cine- 

 rea fusco tessellata induta ; anfr. 6, ultimo tricarinato (ceteris bicari- 

 natis) ; basi convexiusculo polito ; umbilico amplo, conico, carina plicata 

 marginato : apertura circularis ; columella vix reflexa, ad carinam um- 

 bilicalem terminante. Operculum corneum, lineis incrementi con- 

 cinne granulatis. Axis, 6 ; diam. o millim. Inhabits Hong Kong 

 Harbor, in 10 fath., shelly gravel. "W. S. 



Allied to JM. carinata, hiangulosa, &c. 



Margarita articulata. T. parva, globoso-conica, livescens ; 

 anfr. 6, rotundatis, ultimo fills circ. 5 (ceteris 3) cinctis, juxta suturam 

 excavatis ; fills coloribus pallidis et obscurioribus alternantibus articu- 

 latis, interspatiis concinne clathratis ; basi nitido concentrice striate ; 

 umbilico amplo eleganter pHcato : apertura circularis ; labro tenui. 

 Axis, 5 ; diam. 6 millim. Inhabits Simon's Bay, Cape Good Hope. 

 W. S. 



Much like J/. dUecta A. Ad. 



Margarita albula. T. parva, tenuis, ovato-turbinata, pallide 

 grisea, striis volventibus tenuibus insculpta ; anfr. 4 cito crescentibus, 

 rotundatis, ad peripheriam obtusis ; basi convexo, arete perforate : 

 apertura subcircularis ; peritremate acuto, fere continuo. Axis, 5 ; 

 diam. 8 millim. Inhabits Arctic Seas. W. S. 



Much like an overgrown M. arctica, but it is covered with an 

 opaque calcareous crust ; the suture is less impressed ; the umbilicus 

 smaller, and it is everj-where spirally striated. 



IVIargarita mustelina. T. minuta, tenuis, globoso-conica, infra 

 concentrice striata, livida albo prop^ suturam parce strigata ; anfr. 4 

 ventrieosis ; peripheria obtuse angulata ; basi rotundato late perforate : 

 apertura ovata ; columella tenui, arcuata. Diam. 4 ; axis, 3 -f- m illim. 

 Inhabits Hakodadi Bay, at low water. W. S. 



Margarita lenticula. T. minuta, depressa, lenticularis, con- 

 cavo-convexa, lactea, striis tenuissimis ordinatis cincta ; anfr. 4 de- 

 clivibus, prope suturam excavatis ; area umbilicali lira ivL labro 

 desinente cincta : oblique et arete perforata : apertura rotundata 



