186 
HORN EXPEDITION—MOLLUSCA. 
The sculpture consists of distant and regularly-disposed spiral incised lines, 
and fine transverse stria?. 
Dimensions. —Diameter, Do; height, about -5. 
Localities. —Taken at most localities alive ami in abundance, sheltering beneath 
fig-trees. Ilpilla Gorge, Spencer Gorge, Finke Gorge, Redbank Gorge, Palm Creek, 
Alice Springs. 
“ A dozen specimens of this specie.s, unnamed, and labelled Victoria River, 
North Australia, are in the British Museum ” {^fide Edgar A. Smith). 
Remarks. —The original reference of this interesting .shell to Planispirn was a 
lapsus mentis for Polygyra. The species offers no near analogy to any Australian 
land-shell, though it recalls Plectopylis ; the name lias reference to the half-closing 
of the aperture by the parietal plate. 
At the suggestion of Mr. C. Hedley I have transferred the species to 
Microphyura., it is cognate with Helix microphis, Crosse, for which Anstey has 
proposed the sectional name APicrophyura (see Pilsbry, Man. Conch., 2nd ser., 
vol. ix., p. 84), but which Mr. Hedley considers of generic value. 
Endodonta (Charopa) aemula, Tate. (Plate XYII., Fig. 2.) 
Refei’ence— Charopa cemula, Tate, Trans. Roy. Soc. S. Aust., vol. xviii., 
p. 192, 1894. 
Shell planorbiform, .spire very slightly sunken. Whorls four and a half, 
slowly increasing in width, deeply channelled at the suture, convex, abruptly 
ascending from the posterior suture, gently sloping to the front suture. Last 
whorl not descending at the aperture, channelled at the suture, rising abruptly and 
narrowly to the ante-sutural angulation, thence regularly and tumidly convex to 
the more gently-curved base. Umbilicus about one-sixth of the width of base, 
deep, conical, exposing the penultimate whorl, with regularly-sloping walls. 
Aperture lunate, very slightly oblique, peristome sharp, straight, except for the 
slight columella-reflection; outer lip slightly produced medially, behind which 
there is a faint constriction ; margins joined by a thin callus whi^h projects back¬ 
ward beyond the alignment of the peristomial junctions with the body-whorl. 
Colour. —The thin subpellucid test is pale horn. 
Sculpture on the ordinary spire whorls consists of sharp, erect, lamelliform 
costie, having a slight forward trend on the upper surface ; on the last whorl they 
