South■ Australian Shells 
s..\. NAT., VOL. XV. 
march 27th, 1934. 
yellowish, ;.nd having riblets at interval, speckled with brown; 
radial ribs made irregular bv irregular growth wrinkles, anterior 
libs alternately large and small. Length 27.5, breadth 14. height 
8 mm. (icncrallv distributed but uncommon, from McDonnell 
Rav, South Austraia, to Bunburv, Western Australia, beach and 
dredged to 15 fathoms. (Type locality—Tasmania). 1 he peris¬ 
tome curves strongly upwards posteriorly, and this end is more 
bluntly broadly rounded than the other. Front end not curved 
upwards, the radiating riblets are much stronger on long anterior 
slope, and alternate with much smaller ones. ’1 he orifice is on 
the posterior slope, which is below is broadly eroded, erosion not 
extending to posterior edge of. shell. Inside white, except tract 
on each side and in front of fissure which is pink. Fissure twice 
as long as its greatest width, surrounded by a callus, wide except 
on the back margin. Muscular Impression narrow, deeply im¬ 
pressed. 
M. roseoradiata Fenison-W oods 18/6. A coloured variant 
having numerous rose-coloured rays. I ncommon, on beach. St. 
Francis Island. Tenison-W oods introduced this as Mactochhmci 
zceldii vaix rosco-rad icA a. 
Austroglyphis gen. nov. Shell comparatively large, beauti¬ 
fully sculptured by prominent radials. larger posteriorly, crossed 
by concentric laminae forming distinctive, elevated, digitate scales 
at the intersections; internal callus surrounding the perforation 
truncate posteriorly; externally the perforation is rectangular, al¬ 
most square, corners rounded, each of the four sides bulging in¬ 
wards at the middle. Radula formula 1.4.1.4.1. consists of a wide 
central tooth set obliquely on the radula; four very narrow later¬ 
als; one large major lateral having two cusps, the under and larg¬ 
er much stronger than the upper; an indefinite number of very 
■narrow marginals attached to a base which is apparently folded. 
(Type —Diodora lincolntiisis Cotton 1930). Distinguished from 
lAigidion Iredale by the sculpture and truncation of the internal 
callus of the perforation, 
A. lincolnensis Cotton 1930 (not Fissurella jukesii Reeve 
1849, from Queensland). PI. 1. fig. 9. “The Port Lincoln Austro- 
glyphisA Ovate, wider posteriorly, elevated, conical; posterior 
slope convex, anterior slightly concave; perforation rectangular, 
small; yellowish, radials tinged with brown, depressions caused 
by latticed sculpture blue; radial ribs, eighteen, prominent, larger 
posteriorly, with cue smaller interstitial between the twelve an¬ 
terior, and two between the posterior; concentric laminae, eight¬ 
een, cribs the radials. forming digitate scales at intersections; 
internal callus, surrounding the perforation, truncate posteriorly. 
Length 41. breadth 29.2, height 18 mm. Not common. Newland 
Head, Backstairs Passage. Brighton, Investigator Strait, Corney 
