VOLVULA. 239 



The Volvula acuta d'Orb. a Cuban species, is much sharper and 

 more hunchy. Volvula angustata A. Adams, is more cylindrical 

 and less stumpily pointed above. (Wats.'). 



(West- American species.') 



V. CYLINDRICA Carpenter. Unfigured. 



Shell cylindrical, white, shining, encircled by distant spiral 

 striae ; flattened in the middle, the margins nearly parallel, rather 

 effuse below, sudienly narrowed behind; canal very short; lip 

 acute ; inner lip indistinct ; columellar fold small, very sloping. 



Alt. -17, diam. '07 in. (Cpr.). 



Sta. Barbara, California. 



Volvula cylindrica CPR., Ann. Mag. Nat. Hist. (3), xv, p. 179 

 (March, 1865) ; Moll. Western N. A., Smiths. Misc. Coll. no. 252, 

 pp. 23, 133, 281. 



(Indo- Pacific, Japanese and Australian species*). 



V. EBURNEA A. Adams. PI. 26, fig. 66. 



Shell ovately cylindrical, white, smooth, solid, shining, inferiorly 

 transversely striated, beaked at both ends ; aperture narrow poste- 

 riorly, dilated anteriorly ; outer lip posteriorly inflexed ; inner lip 

 callous; umbilicus none. (Ad.'). 



China Sea (Cuming). 



B. (Volvula} eburnea AD., Thes. Conch, ii, p. 597, pi. 125, f. 155. 



V. STRIATULA A. Adams. PI. 26, fig. 64. 



Shell small, ovately cylindrical, beaked at both ends, entirely 

 transversely striated ; spire concealed ; aperture linear, anteriorly 

 slightly dilated ; outer lip straight, slightly inflexed in the middle ; 

 inner lip strongly twisted, with a single plait. (Ad.). 



China Seas (Cuming). 



B. (Volvula) striatula AD., Thes. ii, p. 597, pi. 125, f. 156. 



V. OPALINA A. Adams. Unfigured. 



Shell elongate-oval, rimate, white, semipellucid, smooth, shining, 

 obsoletely transversely striated in front ; mucro short, produced 

 (with the lip) in an angle; aperture narrow, inner lip thin, oblique, 

 incurved ; outer lip regularly arcuate. (Ad., Ann. Mag. N. H. (3), 

 ix, p. 154, 1862). 



Mino-Sima, Japan, 63 fms. 



