7 : ‘ 
58. Acanthochites_ rufus, sp. nov. PI. vi., figs. 4u-/. 
General Appearance.—Elliptical, roundedly arched, 
much more so than A. variabilis, valves beaked, colour uni- 
formly terra-cotta. 
Anterior Valve.—Five very indistinct riblets, which are 
really waves in the pustules. The pustules are in regular 
lines, appearing continuous with those on the second valve. 
Median Valve.—Covered with pustules arranged in 
longitudinal lire. There is little difference between the 
dorsal, lateral, and pleural areas. There are about twelve 
rows of these pustules on the latero-pleural area divided by 
sulci, and about fourteen rows on what may be termed the 
dorsal area. The microscopic pustules in these are much 
smaller than those in the latero-pleural areas. There is a 
gradual elevation towards the posterior end of each valve, 
and the pustules in this lateral region are more irregular. 
Posterior Valve.—Mucro very indistinct, post median. 
A deep sulcus parallel to the girdle separates it from the 
outer edge of the shell. Rows of pustules converge towards 
the mucro and appear continuous with the rows on the 
median valves. Nine rows on the latero-pleural areas and 
twelve on the dorsal areas. The mucro is almost at right 
angles to the girdle, and the rows of pustules are concentric 
below the mucro. 
Girdle.—Leathery, very narrow in dried specimen, covered 
with spinelets. Five corneous spots on the girdle surround- 
ing the anterior valve and one at each suture, very indis- 
tinct in some. 
Measurement.—10 x 5 mm. 
/1ab.—One specimen only from Kangaroo Island. 
Remarks.—The detailed description of this shell ap- 
proaches A. variabilis, but the absence of the distinction 
between the dorsal and the latero-pleural areas and the 
marked difference in the appearance and shape of the shells 
when placed side by side make it necessary to place it in a 
new species, 
The name rufus is given on account of its rich terra- 
cotta colour. 
59. Acanthochit@é kimberi, sp. nov. Pl. vi., figs. Suey. 
General Appearance.—Long, narrow, tapering towards 
the ends. Valves rounded, beaked. Colowr.—Wither cream 
with splashes of dark- and light-green or, in some specimens, 
the green predominating over the cream with splashes of 
pink on some valves. 
FSU 
FGiom 
