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 

 0-017 inch (Wats.). 



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



C. crispula WATS., 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 subcylindrical, harshly reticulated, white, 

 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 : Longitudinals 

 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 



