384 



Genus Crithe. Animalis discus elongatus, antice truncatus, 

 ano-ulis vix productis, postice obtusus ; collum dimidiam latitudinis 

 disci, antice bifurcatum ; tentaculis brevibus triangularibus, oculis 

 minutis externis, basalibus. Testa porcellana, convoluta, utrinque 

 rostrata : apertura angusta, arcuata; labro simplici ; ventre laminis 

 transversis acutis totus arato. 



Crithe atomaria. T. minutissima, lactea, ovularis, levigata : 

 apertura coarctata, laminis ventralibus ad octo. Axis 0.5 ; diam. 

 0.3 millim. Inhabits the China Seas. W. S. 



Shell very minute, milk-white, glossy, ovate, somewhat acute 

 at extremities, most so at summit, where there is a delicate groove ; 

 aperture very narrow and uniformly so ; rostrum short, slightly 

 recurved; ventral'laminae directly transverse, about eight in num- 

 ber, and, as the pass into the aperture, giving the appearance of 

 coarse denticles on the pillar. 



This peculiar little shell is the only one of the genus yei ob- 

 served. The animal is citron -colored, the viscera slate-colored, 

 the eyes reddish black, very small. 



Persicula tantilla. T. minuta, oliviformis, Candida, polita : 

 spira occulta : apertura linearis antice vix dilatata ; labro apicem 

 paullo superante, simplici acuto ; columella plicis obliquis acutis 5 

 munita. Axis 3 ; lat. 1.5 millim. Inhabits China Seas. W. S. 



It has the form of P. imbricata. 



Marginella (Glabella) lepida. T. minuta, ovato-trigona, 

 tenuis, polita, lactea : spira elevata lateribus concavis ; anfr. 3 : 

 apertura angusta ; sinu postice parvo ; labro incrassato concinne 

 crenulato ; columella denticulis acutis 4, postico minimo, et plica 

 siphonem circumambiente instructa. Axis 3 ; diam. 2 millim. 

 Inhabits China Seas. W. S. 



Allied to M. Icevis. 



Marginella seminula. T. minuta, ovoidea, polita, tenuis, 

 lactea : spira obtusa, vitro cooperta : apertura antrorsum dilatata, 

 postice rotundata ; labro simplici postice subsinuato et in plicam 

 posticam columellee desinente ; plicis 4 perobliquis ; columella 

 nuda. Axis 4 ; diam. 3 millim. From a Gorgonia in False Bay, 

 Cape of Good Hope. W. S. 



