A REVISION OF THE AUSTRALIAN TURRIDB—HBDLBY. 239 | 
the outer lip is turned inwards, giving rise to a short free edge. The 
callus on the columella is a thick sheet, the anterior edge of which is free 
from the preceding whorl. Length 16 mm., breadth 5-5 mm. 
This species is closely allied to and perhaps a variety of I. spaldingi 
Brazier. The differences are that fibrutus is longer and narrower, with 
more ribs and more prominent spirals, and especially with a secondary 
sculpture of minute hair lines which develop into a subsutural row of 
close minute prickles. 
Hub. Queensland :—4 to 14 fathoms, Albany Passage (type, self) ; 
Cape York; Darnley Island (Brazier) ; Facing Island; Port Curtis 
(Kesteven), 
INQUISITOR FLINDERSIANUS sp. 1/00. 
(Plate xliy., fig. 28.) 
Pleurotoma ulubaster var. Brazier, Proc. Linn. Soc. N.S.W., 1., 1876, p. 154 
(not P. alabaster Reeve). 
Shell rather large and solid, slender fusiform. Whorls eleven. 
Colour ochraceous-salmon, with a pale zone on the shoulder. Sculpture :— 
Fasciole slightly excavate, crossed by crescentic lines, and traversed by 
fine threads; ribs discontinuous, oblique, widely spaced, round-backed, 
bolder on the upper whorls, disappearing on the ventral side of the last 
whorl, but re-appearing on the dorsal; set at twelve to a whorl; spirals 
are flat-topped cords which over-ride the ribs—about twenty-two on the 
last whorl and five or seven on the upper whorls; their furrows are 
crossed by microscopic hair lines, and often traversed by an interstitial 
thread. Aperture:—Mouth narrow; varix broad and low, about its own 
breadth within the edge of the free flap which stretches across the mouth; 
sinus deep, oblique, narrowed at the entrance; columella straight; inner 
lip with a raised margin; canal short, open. Length 31 mm., breadth 
11 mm. 
Hab. Queensland :—10 fathoms, Mapoon (type) ; 4 to 14 fathoms, 
Albany Passage; 5 to 8 fathoms, Murray Island (self); 30 fathoms, 
Darnley Island (Brazier). 
INQUISITOR FORMIDABLLIS sp. 100. 
(Plate xliv., fig. 29.) 
Shell large but comparatively thin, fusiform, subturreted, sharply 
pointed; spire produced; base contracted. Whorls thirteen. Colour 
grey-buff, maculated with chestnut at the sutures. Sculpture :—The 
radials are oblique, wide-spaced, low peripheral nodular riblets, ten on the 
penultimate, and eleven on the last whorl; on the earlier whorls the ribs 
ascend the spire perpendicularly and continuously, but on the lower 
whorls they are less developed and less regular; there is a secondary 
sculpture of fine radial threads which sometimes crowd the interstitial 
spaces of the spirals; on the last whorl are about thirty-two broad spiral 
cords, and on the penultimate ten; in their interstices one or more spiral 
