316 CYLICHNA. 



forms the top of the shell ; at this point it is narrowly rounded and 

 retreats very much, below this its edge advances and its direction 

 is obliquely forward to the right ; in front it retreats rather rapidly 

 and sweeps freely round the base to the point of the pillar ; it is a 

 little bent in about the middle, but is very patulous on the base. 

 Top is very small, and fully half of it is covered by the lip, but be- 

 hind this there is a minute conical depression with a defined 

 rounded edge. Inner lip is regularly arched on the body, where 

 there is a thin glaze, which becomes thick on the pillar with a 

 twisted sharply defined edge. Pillar bears a strong, almost direct 

 tooth, with a well marked broad furrow between it and the lip 

 edge. Alt. 0-16 in., diam. 0*075. Mouth, breadth at same place 

 ()-017 inch (W<(ts.). 



Maine Island, Cape York, N. Australia, 155 fms. 



a crispula A¥ats., Chall. Gastr. p. 666, pi. 49, f. 12. 



This species is deceptively like a Volvula. In general form it 

 resembles Atys parallela (Gould), but is smaller, is more contracted 

 above, and is there minutely perforated ; the tooth in front, too, is 

 stronger, and the spiral sculpture is much finer (^Wats.). 



C. RETICULATA Watson. PI. 30, figs. 5, 6. 



Shell small, oblong to subcyliudrical, harshly reticulated, Avhite, 

 with a narrow scarcely curved mouth, a lip produced posteriorly, 

 an oblique perforated top, a subpatulous direct and oblique pillar 

 lip reverted on a narrow umbilicus. Sculpture : Lougitudinals — 

 the whole surface is scored with strong rounded furrows, which fol- 

 low the lines of growth and are parted by interstices about once 

 and a half their width. Spirals — similar to the longitudinals, but 

 rather stronger and further apart, are spiral furrows, the intersec- 

 tion of which with the longitudinals cuts the surface into square re- 

 ticulations. Colour translucent white. Mouth long and narrow, 

 widening very little in front, curved a very little throughout its 

 whole length. Outer lip rises above the top, bending a little in 

 toward the perforation ; in direction it is slightly curved through- 

 out, its edge retreats somewhat above, in the middle, and in front. 

 Top is small, oblique, with a slightly expressed, narrowish, thick- 

 ened, harshly radiatingly scored rim, within which is a funnel- 

 shaped perforation. Inner lip : a thickish glaze crosses the well- 

 arched body and runs out on the slightly patulous, direct, oblique 

 prominent and narrow-edged pillar, behind which and half covered 



