42 
Toil Ieedale. 
Tliiek', again, o\'erlookiug tliis species, referred specimens to cuprcu will: 
the size .'ijo nim. by 2 lum., the protocouch finely sculptured spirally, and 
the adult ivhorls decussate. The size and the sculpture refer the specimens 
to this species, rather than to cuprea. Benson’s deseri]ition is here offered 
for reference: “Shell broadly umbilicate, orbiculately depressed, horny, fui'- 
nislied with rather rwnotc' olili(iue eostulate radials; spire scarcely a. little 
convex, sutures excavate, apex planatc; whorls four and one-half, convex, 
last rounded, aiiertui'c' suljvertical, roundly lunate, peristome acute, Timbilicus 
perspective.’’ Reeve (igui'ed the type specinum tlu' same year, and added 
to the above description “decussated, beneath the lens, in the interstices with 
very minute spiral striae” and showed this character in his illustration. 
Luinodiscus repens sp. nov. 
Plate I., fig. 21. 
Another of Mr. Riflney W. .Jackson’s discoveries at the Bow River and 
Deep River, this species is the largest yet found of this group, measuring 
6 mm. in breadth by 2..') mm, in height. 
The shell is fawn flamed with red. 
Apex large, of two whorls, finely spirally lirate, about fifteen lirao 
counted from above, almost a varix intervening before the adult radial sculp- 
ture begins. This, on the first adult whorls, consists of about one hundred 
regular line radials, the interstiees being finely concentrically striate, almost 
giving the effect of fine beading to the radials. 
The shell is tlat-top]H‘d, the mouth large, wldle the uml)ilicus is narrow 
and deep, measuring about one fourth of the basal breadth. 
Luinodiscus tumidus Odhner 1917. 
Plate IIP, fig. 2. 
1917 — Endoclonta (CJiaropa) tumirla Odhnei', Kungl. Rvensk., Vetensk., 
Haiull. Bd. 52, No. l(i, |). 72, ])1. 3, figs. 72-74, 8(>i)t. 19. Noonkau- 
bali, Fitzroy River, Xorth-lVest Australia. 
Odhuer's description was somewliat brief, hut from a i)araty])e more 
eletails can he given. 
Shell discnidal, spire concave, umbilicus moderately wide (narrow, half 
the width of the last whorl, Odhner) mouth open lunate no teeth in a])erture 
outer lip Ihin columella straight slight callus joining ]i|is but outer lip 
descending a little so that it does not reach nl)ove the level of the last whorl, 
sutures d(>ep, almost excavate, whorls well rounded. Tin- jii)i('al whorls ai’c 
two, ending in a varix, ami are sculplnred with taint concentric striae which 
are overridden by distant radial lirac of the same charactm' as the adult 
sculpture. This consists of regularly closely .spaced ridges, about eighty on 
the first adult whorl and continuing similarly closely i)acked to the end of the 
last whorl. The interstices a)'e very finely, regularly, closely, concentrically 
striate. J’lie ty[)e measured 3.9 mm. in breadth, the heiglit 2 ram., the sjxa-i- 
men above deseiibed being vei'y slightly snuiller. 
It is eiii'ious tliat the majority of \V('stern jVnstralian C'haroi)ids so far 
found have the ai'ieal whorls eoueeiitrically striate, the striae varying in 
strength, thus while cupreus has the striae well marked almost lirae, snhlestus 
has the whorls almost smooth, the eoneentric striatioiis being seen only by a 
strong lens and then they are obscure. Tin' present species has the apex 
