668 THE VOYAGE OF H.M.S. CHALLENGER. 



which with tbe longitudinals cuts the surface into square reticulations. 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 throughout : its edge retreats somewhat 

 above, in the middle, and in front. Top is small, oblique, with a slightly expressed, 

 narrowish, thickened, 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 by it is a furrow running up into the umbilicus. H. 0"11 in. B. 0"05. 

 Mouth, breadth at same place, 0'009. 



This is a remarkable species, with, very exceptional sculpture. The apical pore is so choked with 

 impacted sand that it is impossible to say whether the spire be visible or not. 



11. Cylichna suhrcticulata, Watson (PI. L. fig. 3). 



Cylichna mbretimlata, Watson, Prelim. Report, pt. 19, Journ. Linn. Soc. Lond., vol. xvii. p. 323. 



Station 187. September 9, 1874. Lat. 10° 36' S., long. 141° 55' E. West of Cape 

 York, North Australia. 6 fathoms. Coral mud. 



Shell. — Small, oblong, subreticulated, white, with a narrow curved mouth, a lip slightly 

 produced posteriorly, an oblique perforated top, a short patulous subtwisted pillar, round 

 whose base is a slight fold, and whose edge is appressed. Sculpture: Longitudinals — 

 there are irregular and not strong lines of growth. Spirals — there are coarse, but feeble, 

 rather remote furrows which cover the whole surface. Colour translucent white. Mouth 

 curved, a little broader above and below than in the middle. Outer lip rises very little 

 above the top, bending out, a very little yet at once, from the apical pore : it is strongly 

 curved throughout. Top is small, slightly oblique, with a scarcely definite feebly scored 

 rim, within which is a funnel-shaped perforation. Inner lip: a thin glaze, with an 

 irregular edge, spreads across the body, which is well rounded : round the top of the 

 oblique pillar is a feeble furrow and fold ; the lip edge is appressed, and has behind it a 

 very slight depression, but no umbilicus. H. 0'106 in. B. 0"056. Mouth, breadth at same 

 place, 0-013. 



This species is very like Gi/licJma reticulata, but differs from it in that the shell is broader in 

 proportion to length ; the mouth is broader and more curved ; the strongly reticulated sculpture is 

 absent, what there is being much feebler and less regular, 1 this is especially the case with the 

 longitudinal furrows ; the outer lip rises less high behind and does not lean in at all to the perfora- 

 tion ; the edge of the top is less oblique ; the pillar lip has a fold at its base, and the lip edge is 

 reflected and appressed, and has no umbilicus behind it. 



1 Hence the name. 



