592 



106. Bulla corticata (pi. cxxv. f. 138), MoUer, Ind. 

 Moll. Greenland, p. 79. 



B. testa cylindrica, imperforata, solidiore, fulva, striis longitudi- 

 nalibus undulatis minutissimis ornata ; apice immerso, callo colu- 

 mellari obtecto. 



Shell cylindrical, imperforate, rather solid, fulvous, with very 

 minute longitudinal undulated lines ; apex sunken, covered by the 

 umbilical callus. 



Greenland. Mus. Cuming. 



107. Bulla teiticea (pi. cxxv. f. 139), Courthouy, Bost. 

 Journ. Nat. Hist. 



B. testa paivula, cylindrica, umbilico obtecto, solidiore, epider- 

 mide subfusca obtecta, transversim sub lente subtihssime striata ; 

 apice immerso, callo columeUari obtecto ; apertura angusta, sub- 

 lineari, ad basin dilatata. 



Shell small, cylindrical, umbilicus covered, rather sohd, covered 

 with a brownish epidermis under the lens, very finely transversely 

 striated ; apex covered with the columellar callus ; aperture nar- 

 row, somewhat linear, dilated at the base. 



Massachusetts, U. S. Mus. Cuming. 



108. Bulla umbilicata (pi. cxxv. f. 140), Montagu. 



B. testa ovato-cyHndracea, alba, laevi, longitudinaHter substriata, 

 apice umbilicato, antice subacuminata; apertura angusta, antice 

 dilatata ; labio antice uniplicato. 



Shell ovately cylindrical, wliite, smooth, longitudinally sub- 

 striated, apex umbiHcated, shell anteriorly rather narrowed ; aper- 

 ture narrow, anteriorly dilated ; inner lip anteriorly with a single 

 plait. 



British Islands. Mus. Kanley. 



109. Bulla strigella (pi. cxxv. f. 141), Loven, Ind. Moll. 

 Scand. p. 10. 



B. testa cylindrace^, postice subtruncata, striis spiralibus tenuis- 

 simis undulosis sculpta j apice umbilicato, minuto, tereti, pro- 

 fundo, perforato, peromphalo soHdo, niveo; labropariimrecedente; 

 columella callosa, plica distincta ; aut nuda, nitida, aut epider- 

 raide fusca tecta. 



Shell cylinchical, posteriorly somewhat rounded, engraved with 

 very fine undulating transverse strise ; apex minutely teretely um- 



