VOLVULA. 241 



rowed in the middle, produced above, dilated below, outer lip con- 

 tracted in the middle; inner lip with a single fold. (Ad.'). 



Cagayan, Mindanao, 25 fms. (Cuming) ; Endermo Harbor, Japan) 

 4-7 fms. (Smith); Off Katow, New Guinea, 8 fms. (Brazier). 



B. (Volvula) angustata AD., Thes. Conch, ii, p. 596, pi. 125, f. 

 153. BRAZ., P. L. S. N. S. W., ii, p. 83. SMITH, Ann. Mag. N.H. 

 (4), xvi, p. 114. 



V. ROSTRATA A. Adams. PI. 26, fig. 60. 



Shell elongately oval, white, pellucid, beaked at both ends, lon- 

 gitudinally substriated, transversely (under the lens) very minutely 

 striated ; aperture narrow, linear ; outer lip equally arched ; col- 

 umella tortuous, with a single plait. (Ad.). 



Port Lincoln, Australia. 



B. (Volvula) rostrata A. AD., Thes. Conch, ii, p. 596, pi. 125, f. 

 154. 



V. SULCATA Watson. PI. 26, fig. 56. 



Shell oblong, very symmetrically -curved, bluntly pointed above, 

 and still more bluntly in front, white, very faintly spiralled, but 

 with the center part of the body plain. Sculpture : Longitudinals 

 there are very slight lines of growth. Spirals at the lower end 

 of the shell there are about ten very slight fretted spiral furrows; 

 those above are rather sparse and irregular, those toward the point 

 are crowded and feeble; the larger part of the shell is plain, while 

 above are a few spirals still feebler than those in front. Colour trans- 

 lucent white. Mouth arched ; about the middle the arch is flattened 

 and narrowed, broadening a very little above and somewhat more in 

 front ; above, it rises bluntly beyond the top of the body, and in 

 front it just passes the point of the pillar. Outer lip is very little 

 curved in the middle, but bends in toward the axis at either end ; its 

 edge retreats a little above, but only very slightly in front. Top is 

 bluntly and roundly pointed. Inner lip : there is a small transpar- 

 ent pointed pad where the outer lip rises from the tip, the curve of 

 the body is regular, but just at the top of the pillar is a slight 

 contraction ; the pillar, which has a very faint tooth at its base is 

 slightly oblique, and markedly twisted out to the very point ; it has 

 a flat, expanded and broadening front, with a sharp reverted edge, 

 behind which is a rather strongly marked furrow, but no umbilicus. 



