CYLICHNA. 323 



This species may be at once recognized by the lacteous bands 

 upon a hyaline ground, and by the peculiar subtruncation of the 

 columella, which almost forms a short channel with the outer lip 



Subgenus MNESTIA H. & A. Adams, 1854. 



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

 and C. marmorata). 



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

 oration. 



C. MARMORATA A. Adams. PL 27, tig. 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 ; stria? 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.). 



Capul, Philippines. 



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



C. BIZONA A. Adams. PL 27, fig. 84. 



Shell ovately cylindrical, fulvous, encircled with two pale red 

 brown bands, longitudinally obsoletely plicated, engraved with dis- 

 tinct transverse finely undulated striae ; 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) ; Levuka, Fiji 

 .(Challenger) ; Tories Strait (Brazier). 



Bulla (Cylichna') bizona A. AD., Thes. ii, p. 595, pi. 125, f. 148. 

 Cylichna (Mnestia) bizona H. & A. AD., Genera, ii, p. 10. 

 WATSON, Challenger Gastrop. p. 671. Mnestia bizona BRAZ., 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. 



