280 MR. K. A SMITH ON THK C-^l""' '> 



fenuis ; anfracius o, conceA, microscopice sjuralifer striafi, 

 Kiitiiru st/b2)rofu/uhi sejiincti ; apertura ouata, supenie paitlo 

 acuminata, longit. totliis § subcequaiis ; peristoma tenue, 

 continuum, 'margine columellari nngunte reflexo. 

 Longit. Sj miUim., diam. 1|. 



The spiral striae are so fine that they can only be seen under a com- 

 pound microscope. Under a simj)le lens the surface appears smooth. 

 Coitthouyia plicifera, A. Adams, has the aperture more distinctly 

 channelled anteriorly, and the umbilicus defined by a carinate 

 margin. 



UiALA FuscoPicTA. (Plate XXI. tig. 20.) 



Testa minuta, imperforata, conica, tenuis, uite/is, albo-pellucida, 

 strigisfuscis longitudinalihus, et zona interrupta lactea ad 

 peripheriam picta ; anfvactus 5, fix convcxiusculi, primi duo 

 spiraliter temiiter striati, cceteri Iceces, ultimus in medio 

 rotunde angulatus ; apertura mcdiocriter tnagna, longitudinis 

 totius h fix cequans ; lalrum tenue j columella recti iiscula, 

 leviter obliquu, antice suheffusa. 

 Longit. 2| inilliin., diam. Ig. 



This pretty little shell has the surface smooth, with the exception 

 of the first two whorls, which are finely spirally striated. Tiie 

 upper extremities of the brown stripes do not extend quite to the 

 suture, and on the body-whorl pass betweeu the opaque-white row of 

 dots at the perij)hery. 



lilSSOINA MELLISSI. (Flatc XXIII. fig. 34.) 

 Testa ocuto-turrita, alba, soUdiuscula ; anfractus sex, supremi 

 duo convex iusculi, spiraliter striati, cceteris superne tabulati 

 et rotunde angulati, costis validis circiter 11 (/« anfr. 

 ultimo ad basim continuis) instructi, striisque s^nralibus 

 fenuissimis sculpt i ; apertura oblique ovata ; labrum incras- 

 satum, dujilex, superne subsinuatum ; margo columellaris 

 callo refiexo, superne labro juncto, indutus. 

 Longit. '.i millim., diam. Ih 



This is a strongly costate species, with very fine transverse striae 

 on and between the ribs. The outer basal margin of the aperture 

 Las a double lip, and the ribs are more or less regularly continuous 

 up the spire. 



RissoiNA TURTOM. (Plate XXIII. tig. 35.) 



Testa gracilis, turrita, alba; anfractus 6-7, convexi, sutura 

 obliqua sejuncti, primi duo spiraliter lirati, cceteri costis 

 longitudinalibus 10-12 tenuibus, oblique curvatis, instructi, 

 transversiin inter castas tenuissinie striati ; apertura obliqua, 

 parca, longit. totius g vix cequans, ad basim late effusa ; labrum 

 mediocriter incrassatum, intus longitudinaliter striatum; 

 columella obliqua, paruin arcuata. 



Longit. 3 inillim., diam. 1. 



The spiral lirae upon the apical whorls are |)eculiar, and the aj»ex 

 itsell is large in proportion to the size of the shell. 



