VOLVULA. 



239 



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

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

 and less stumpily pointed above. ( Wats.). 



(^West-Ainerican species.) 



V. CYLiNDRiCA Carpenter. Uu figured. 



Shell cylindrical, white, shining, encircled by distant spiral 



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



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



acute ; inner lip indistinct; coluraellar fold small, very sloping, 



Alt. -17, diam. -07 in. (C>r.). 



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. QQ. 



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. 



