The 
South Australian Natu 
Vol . XV I. A DELAIDE, DECEM BER 15th, 1934. No. 1. 
SOU1 H AUSTRALIAN SHELLS. 
(Including descriptions of New Genera and Species). 
(By Bernard C. Cotton & F. K. Godfrey). 
PART XIII. 
TROCHIDAE (Contd.) 
A'ustrococMea Fischer 1885, Turbinate-conic, heavy, thick, 
solid; columella rather strong, only slightlv toothed at base, not 
notched; aperture as high as wide; outer lip lirate within. Type 
M onodonta constncta Lamarck. 1 his genus differs from Mon- 
udonta Lamarck, in having the columella only slightly toothed, 
and in the absence of a square notch or channel between the 
columellar tooth and the basal margin. Restricted to Australia 
and Tasmania. We place in this genus s. str. A. torn and 4 
zebra. 
Fractarmilla Finlay 1926 (subgenus). Shell globose-con- 
ical, solid, imperiorate, surface dull corroded; obsoletely spirally 
cingulate, apex eroded; base flat; aperture oblique, nacreous, 
smooth within; outer lip convex, sharp, bordered 'by a narrow 
yellow or white, followed by a black strip; columella oblique, 
short, nearly straight, with one or two tubercles, white, dilated 
upon the parietal wall, but not extending to the upper lip; um- 
bilical tract slightly pitted, subconcave, no pearly band. Type— 
Lubio con os a Adams, fiom New Zealand. Here may be placed 
the South Australian A. concamerata Wood and A. rudis Gray. 
Chlorodiloma Pilsbry 1889 (Subgenus). Depressed conic; 
co oration variegated; fine lines of dark on a lighter ground; colu- 
mella generally green; aperture large, very oblique; columella not 
prominent, flattened, not cylindrical, generally concave, arcuate, 
and slightly denticulate at base or smooth; umbilicus perforate 
or subperforate. Type—Trochus crinitus Philippi 1848. Here 
may be placed A. adelaidae , A. odontis , A. zeus. 
A. torn sp. nov.. PI. 1 , fig. 1 (not A. constrict a Lamarck, 
from eastern Australia). “Torr’s Austrocochlea.” Shell conic, 
turbinate, imperforate, thick, solid; dull gray or whitish, obscure - 
y and iiregulaily marked with zigzag axial stripes but generally 
