KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 52. n:o [6. 87 
Ch. porteri Cox. Mount Tambourine (Oct. 1912), 1 sp., d. 10 mm; Atherton 
(Jan. 1913), 1 sp., d. 9 mm; Blackal Range (#0 1911), 3 sps, max. d. 14 mm; 
Evelyne, in the jungle (April 1913), 1 small sp., d. 6 mm. 
Ch. aridorum Cox. Colosseum (Oct. 1912), 2 sps, max. diam. 6.5 mm; Christ- 
mas Creek (Nov. 1912), 5 sps, max. d. 12 mm; Atherton (Jan. 1913), 3 sps, may. 
d. 15 mm; Carrington (May 1913), 3 sps, max. d. 10 mm; Bellenden Ker (May 1913), 
1] sp., d. 7.5 mm; Yarrabah (June 1913), many sps, max. d. 12.5 mm; Cooktown 
(Sept. 1913), 6 sps, max. d. 10 mm, under Eucalyptus bark; Malanda (March 1913), 
1 sp., d. 11 mm; Herberton (Aug. 1913) many sps, max. d. 15 mm; Cedar Creek 
(April 1913), 3 sps, max. d. 7 mm; Evelyne, in the jungle (April 1913), 1 sp., d.5 mm. 
Thersites richmondiana Pretrrer. Queensland, no definite locality, 1 sp., h. 30, 
d. 49 mm, with animal. Colour uniformly dark brown, lighter towards the apex. 
T. castanea n. sp. (PI. 3, figs. 97, 98; text fig. 44). Shell elevated globose 
with obtuse apex and shallow sutures; whorls moderately convex, the last one obs- 
curely keeled at the periphery, somewhat descendent in front. Colour uniformly 
0 ‘ey apy Pale 15 25 4O bee 
Fig. 44. Teeth from the radula of Thersites castanea n. sp. X 100. 
dark chestnut, with 2 dark olive brown bands, the one peripheral, just above the 
obtuse keel, the other subsutural. An extremely fine, more or less obvious, whitish 
line bounds the suture. Aperture oblique, ovate lunate, peristome widened, expanded, 
of a violet brown colour, the columellar lip reflected, covering the greater part 
of the umbilicus, and joined to the outer lip by a thin callous layer on the body 
wall, spreading in an even curve. Umbilicus surrounded by an obtuse angularity 
at the base of the last whorl. Sculpture very characteristic, consisting of length- 
ened oblique rugae running in two different directions in alternating areas of irre- 
gular form and arrangement. Dimensions: diameter 42, height 38, aperture height 
23 mm. Localities: Cedar Creek (April 1913), 1 sh., d. 36 mm, and many young 
specimens, max. d. 13 mm; Evelyne (April 1913), many young sps, max. d. 9 mm; 
Bellenden Ker (May 1913), 1 young sp., d. 16 mm; Herberton (Aug. 1913), 1 sh., 
d. 14 mm; Atherton (Jan. 1913), 2 sps, max. d. 33 mm (not full-grown); Malanda 
(Febr. 1913), 6 sps, max. d. 25 mm (not fullgrown). 
A somewhat similar sculpture to that of this species exists in both the other 
true Thersites (richmondiana PrEirrEeR and novachollandiae GRay) most obvious in the 
base of the shell; but in these forms the rugae are coarser and, generally, divided 
into irregular granulations instead of being long and undivided. 
