PHASIANELLA. 539 



latter are for the most part arranged in obliquely longi- 

 tudinal series, but oftentimes, owing to the regular thick- 

 ening of the wavy lines at certain distances from the 

 suture all round the shell, a few interrupted spiral bands 

 are formed in addition. A not unfrequent style of paint- 

 ing consists of broad wavy streaks of opaque white that 

 radiate from the suture on a darker coloured ground. The 

 space around the columella is almost invariably pale, but is 

 generally traversed in a longitudinal direction by arcuated 

 lines of colour. The whorls are four and a half in number, 

 are separated by a simple suture, and rapidly enlarge from 

 a small, but not very pointed, apex : those of the quickly 

 attenuated spire, which altogether, when viewed from 

 above (or dorsally), does not occupy more than three- 

 eighths of the entire length, and only one-sixth when 

 viewed ventrally, are somewhat rounded, and in propor- 

 tion to their narrowness are tolerably high. The body, 

 which is manifestly narrower posteriorly, — and this is more 

 readily perceptible when the view is ventral, — is not regu- 

 larly rounded, but both upper and lower slopes are merely 

 convex, and the central portion is a little flattened. The 

 base is imperforated, and is moderately long. The aper- 

 ture, which is closed, when the animal is living, by a solid 

 smooth and lustrous snow-white shelly operculum, is about 

 half the total length of the shell, and four-sevenths of its 

 basal diameter ; it is pure white, devoid of all sculpture, 

 and of a rounded oval shape, the length rather exceeding 

 the width. The outer lip, which is simple, very acute, 

 and arcuated, recedes in front : the pillar-lip is curved, 

 broad, and appressed ; its general inclination is rather 

 perpendicular than oblique. Our largest example measures 

 only three lines and a third in length, and two lines and a 

 quarter in breadth. 



