78 NILS HJ. ODHNER, MOLLUSCA. 
when number of whorls is equal, a less shining surface, a grayish instead of an orange 
colour, and more pronounced transverse rugations of the whorls, as well as by the 
presence of umbilical furrows, which are lacking in M. kreffti. 
M. responsivus Hrepiey. Cooktown (Sept. 1913), 5 sps, max. d. 10mm. The 
specimens differ somewhat from that described and figured by Hepiey (1912) in 
being larger and having narrower umbilicus; besides that, the outer lip of the aper- 
ture is inserted nearly horizontally on the body wall, while in HepLEy’s specimen it 
is very sloping. In the depressed shape, the light reddish gray colour, with a lighter 
base, and the fine striation, the present shells, however, agree very well with the 
typical M. responsivus. The small size of the latter seems to indicate a younger 
individual. 
M. fulva n. sp. (Pl. 3, figs. 883—85, text figs. 28, 29, 306, 32, 35a). Shell 
depressed with the spire slightly prominent; whorls convex, separated by a shallow, 
margined suture. Last whorl well rounded, not descending in front; aperture oblique 
ovately lunate, with simple lips; the lower lip somewhat convexly projecting in the 
middle. Columella sloping, its margin thickened, but scarcely reflected, leaving the 
greater part of the umbilicus uncovered, and with no sinuosity. A thin, minutely 
granular, callous layer joins the columella and the outer lip. Umbilicus narrow with 
no furrows within it. Surface of the shell polished, shining, the lines of growth 
feeble, irregular; no distinct spiral lines. Colour brownish orange, somewhat lighter 
below. Dimensions: diameter 9.5; height 6, breadth of aperture 5.5, height 4.6 mm; 
whorls 5'/2:. Localities: Colosseum (October 1912), 1 small sp., diam. 5, h. 2.7 mm; 
Atherton (Jan. 1913), 4 sps, max. d. 9.5 mm; Malanda (Febr. 1913), 3 sps, max. d. 
7 mm; Cedar Creek (April 1913), 8 sps, max. d. 10 mm; Carrington (May 1913), 
1 sp., d. 4.5 mm. — The specimens from Cedar Creek differ in being of somewhat 
larger size and having a somewhat more elevated spire than the others. 
M. marmorata Cox. Gleen Lamington (November 1912), 1 sp., diam. 12.5, h. 
8 mm. — Hepbiey remarks (1912) that M/. marmorata does not range so far north 
as to Port Curtis, from where it has been reported by Tryon (Man. of Conch. 1886). 
The present specimen also was collected considerably south of this place. It resembles 
the figure given by Cox (1868, pl V, fig. 6) in its elevated spire and angled peri- 
phery, for which reason it is to be referred to the present species. The columella 
does not exhibit the same sinuosity as in M. rustica (HepLEY 1912, pl. VIII, fig. 
42), but is straight, vertical, and simple, reflected over half the umbilicus; the colu- 
mellar margin shows transversal striae outwardly, which plunge down into the um- 
bilicus. 
M. kreffti Cox. Atherton (March 1913), 1 empty shell, d. 11.5 mm; Malanda 
(Febr. 1913), 1 sp., diam. 10 mm; whorls 4°44. The specimens agree completely 
with types in R. M. from Darnley Island, received from Mac Lray. 
