149 



cinctis, interstitiis eleganter clathratis ; basi producta, perforata. 

 Apertura ovalis, parum effusa ; labro concinne serrulato ; colu- 

 mella flexuosa, vitrea, plica parva, obtusa, parum declivi. Axis 

 8.5 ; diam. 4 -j- millim. Inhabits China Seas. W. S. 



This beautifully sculptured shell has the general aspect of 

 Monoptygma, but the columella!* twist of Odostomia. 



Odostomia scalarina. T. elongata, aciculai-is, albida ; nu- 

 cleo parvo, laterali, celato ; anfr. 7 tumidis, postice subangulatis 

 longitudinaliter oblique clathratis, clathris circ. 18 subcontinuis. 

 Apertura ovata ; columella tenuissima, plica inconspicua, declivi. 

 Axis 4 ; diam. 1 -|- millim. Inhabits Loo Choo. W. S. 



Odostomia obtusa. T. oblonga, ovata, crassiuscula, albida ; 

 nucleo pa;-vo, dislocato ; anfr. 5 convexiusculis, sulcis circ. 8 

 remotis cinctis, sutura impressa. Apertura ovata ; labro incrassa- 

 to ; columella tenui, plica parva acuta. Axis 2 -f- ; diam. 1 

 millim. Habitat Port Lloyd, Bonin Is. W. S. 



Odostomia viridescens. T. minuta, solida, conica, viridans ; 

 nucleo celato ; anfr. 5, carinis 3 (5 ad anfr. ult.) conspicuis, per- 

 obtusis, cinctis, interstitiis angustis. Apertura ovata ; labro in- 

 crassato ; plica columellari eminente, peracuta, transversa. Axis 

 3 ; diam. .7 millim. Inhabits China Seas. W. S. 



Remarkable for its pea-green color. 



Odostomia physoides. T. solida, lrevis, elongato-ovata, 

 alba ; nucleo magno, physaeformi, trivolvi, nutante ; anfr. 5 con- 

 vexiusculis ; sutura impressa; basi rotundata. Apertura ovalis ; 

 plica columellari erecta, acutiore. Axis 3 -\- ; diam. 2 millim. 

 Inhabits China Seas. W. S. 



Distinguished from other species by its minute physa-like apex. 



Odostomia soluta. T. lanceolata, tenuis, alba, spiraliter 

 tenuissime striata ; apice helicoideo eminente ; anfr. 8 convex- 

 iusculis, perobliquis, tabulatis ; sutura bene impressa ; basi acu- 

 minata. Apertura angusta, lunata ; labro acuto ; plica columel- 

 lari, modica, perobliqua. Axis 4.5 ; diam. 1 -j- millim. Inhabits 

 Loo Choo. W. S. 



Monoptygma puncticulata. - T. ovato-conica, acuta, lucida, 

 cerea ; nucleo satis magno vix nutante ; anfr. 7 spiraliter tenuis- 



