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retrorsum inclinatis ornata ; apice spirali anfractus 4 dextrorsum, 

 unicum sinistrorsum volventes inonstrante ; crista, elevata, lunata, 

 spiram baud attigente : apertura angusta, ovata. Long. 10; diam. 

 maj. 9 ; diam. rnin. 5 ; crista? alt. 3 millim. Taken at sea, south of 

 the Caroline Islands. W. S. 



The unusual length of the shell, the very elevated crest, equalling 

 half the major diameter, and the waved, almost plicate surface, make 

 this a strongly marked species. 



Tectarius luteus. T. parva, biconica, lutea, ejiidermide cal- 

 earea incrustata, lineis incrementi tenuibus et lineis volventibus 

 minutissimis antrorsum crescentibus reticulata ; anfr. 7, conicis, acute 

 carinatis, ad suturam imbricantibus et subnodulosis : apertura rhom- 

 boidea ; labro acuto ; columella callo erecto induta Axis, 6 -f ; diam. 

 4 millim. Inhabits China Seas. W. S. 



A curious little shell which I was at a loss at first where to place ; 

 but, on the whole, do not hesitate to place it under this genus. 



Sigaretus lucidus. T. parvula, depressa, Candida, tenuis, 

 lineis incrementi et striis volventibus reticulata ; anfr. 3 -f , apice e 

 margine remoto, regione umbilicali concavo, calloso, minute perforato ; 

 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 umbilicata, ad peripheriam sub- 

 angulata ; anfr. 6 -|- ventricosis ; 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. Sclmntarica, Midd., but thinner, more 

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



Margarita musiva. T. pyramidalis, margaritacea, crusta cine- 

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

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

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

 bilicalem terminante. Operculum corneum, hneis incrementi con- 

 cinne granulatis. Axis, 6 ; diam. 5 millim. Inhabits Hong Kong 

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



Allied to M. carinala, biangulosa, &c. 



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

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

 excavatis ; filis coloribus palUdis et obscurioribus alternantibus articu- 

 latis, interspatiis concinne clathratis ; basi nitido concentrice striato ; 

 umbilico amplo eleganter plicato : apertura circularis ; labro tenui. 



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