238 



Rissoa incompta. T. minima, elongata, vitrea, lactea postice 

 rubiginosa ; anfr. 7 rotundatis, costis ad tres cinctis, Iongitudinaliter 

 inordinatim clathratis et indentatis, posticis earinatis : apertura circu- 

 laris, peritremate simplici, incrassato. Long. 2 ; lat. 1 millim. Among 

 coral sand, Florida ; abundant. 



Rissoa (s. g. Setia) patens.' T. minuta, ovata, tenuis, vinosa,levis; 

 anfr. 5-6 ventricosis, linea. subsuturali impressa ornatis : apertura 

 rotundata postice emarginata ; columella parum reflexii ; labro sub- 

 incrassato, fusco. Axis 3 ; diam. 2 millim. Hab. Fort Johnson, Charles- 

 ton Harbor, S. C. 



This minute Rissoid is remarkable for its large aperture and subsu- 

 tural impressed line. 



Mangelia (Astyris) labectjla. T. parva, ovato fusiformis, cerina, 

 macula, castanea intra et extra labium ornata, spiraliter tenuissime 

 striata, Iongitudinaliter ad 16-plicata, plicis ad anfractum ultimum 

 sensim evanescentibus, striis simul crescentibus ; anfr. 7-8 convexius- 

 culis, linea subsuturali impressis : apertura parva, ovalis ; labro 

 gibboso, extus incrassato, intus granulato ; sinu baud notabili. Axis 

 7 ; diam. 3 millim. Dredged off the coast of Georgia. 



The brown blotch on the lip is a sufficient characteristic. 



Bela tjndatella. T. ovato-rhomboidea, lucida, lactea, nitida, 

 vix spiraliter striata ; apice mamillato ; anfr. 4 tabulatis (angulo rotun- 

 dato) linea subsuturali impressis, undulis opacis longitudinalibus ad 8 

 ornatis : apertura longitudine dimidiam testaj adequans. Axis 3 ; diam. 

 1, 5 millim. Dredged in 400 fathoms off the coast of Georgia. 



The transparency and mamillated tip of this minute shell render 

 it plausible that it may be the young of some larger shell. 



Marginella (s. g. Gibberula) lachrijiula. T. minima, ovata, 

 lactea, lucida, nitida, Iongitudinaliter exjlissime striata; apice baud 

 eminente, vitreo : apertura angusta, crescentica ; labro obtuso, extror- 

 sum varicoso postice late arcuato et apicem admodum superante, intus 

 vix crenulato; columella antice 4-plicata. Axis 1, 5 ; diam. 1 millim. 

 Dredged in 400 fathoms off the coast of Georgia. 



This may be distinguished from one or two other minute species 

 found in the W. Indies, by its transparency and its ventricose form. 



Semele xextlis. T. oblongo-ovalis, compressa, baud nitida, alba 

 versus umbones pallide incarnata concentrice laminato-striata et sulcis 

 radiantibus remotioribus concinne reticulata, ad intersectiones punc- 

 tata, et versus extremitatibus muriculata ; umbonibus vix post medi- 

 anis ; plica baud profunda ; dentibus lateralibus satis conspicuis asque 

 ab umbone remotis ; pagina interiori erubescente. Long. 25; alt. 15; 

 lat. 7 millim. From the coast of Georgia. 



The sculpture is similar to that in the young of Lucina tigerina, but 

 much more delicate. 



