VI. n UNA. 



This >p.-nr- may In- at ..nee recognized by the Iactnu~ band- 

 upon a hyaline ground, and \>y tin- p.-mliur nibt rimcation oi 

 colurnrlhi. which almost forms a short channel with the outer lip 



Subgenus MNKSTIA H. & A. Adams, 1854. 



Mnestia ADS., Genera Recent Mollusca ii, p. 10 (for C. bizona 

 and C. 



This group is at present restricted to species with variegated col- 

 oration. 



<X MARMORATA A. Adams. PI. 27, fig. 86. 



Shell ovate, contracted above, produced and rather acuminate 

 below, smooth, shining, variegated with pale red-brown and white, 

 the spots in some specimens disposed in distinct bands, transversely 

 very minutely striated ; strioe most distinct above and below ; spire 

 conspicuous, in the deep umbilicus of the apex ; aperture narrow, 

 acuminately produced above and below ; columella straight, rather 

 callus, umbilicus distinct (Ad.). 



Capt(/, Phi Ii 1-. 



B. (Cylichna) marmorata AD., Thes. p. 594, pi. 125, f. 145. 



. BI/ONA A. Adams. PL 27, fig. 84. 



Shell ovately cylindrical, fulvous, encircled with two pale red 

 brown bands, longitudinally obsoletely plicated, engraved with di<- 

 tinct transverse finely undulated stria? ; spire immersed in the deep 

 umbilicus of the apex ; aperture produced above, linear, dilated in- 

 feriorly ; columella slightly plicated, rather reflected, umbilicus 

 covered ; outer lip inflexed superiorly (Ad.). 



Alt. 5, diam. 2'2 mill. 



China Sea (Cuming) ; Singapore (Dr. S. Archer) ; L'-rnk't, 

 (Challenger) ; Tories Strait (Brazier). 



Sulla (Cylichna) bizona A. AD., Thes. ii. p. 595, pi. 12"). f. 148. 

 (.'iilii-hn'1 (M N. vV A. AD., Genera, ii, p. 1<. 



WATSON, Challenger Gaatrop. p. 671. Mn^tii bizona I'.KA/.. P. L. 

 S. N. S. W. ii, p. 81. 



In the specimens from Singapore before me the bands are a little 

 more widely spaced than in Sowerby's figure. 



