150. 
South Australian Shells. 
S.A. NAT., VOL. XIV. 
August 31st. 193T. 
both apertures slightly flattened, because of a slight dorso-ventral 
compression of the tube; white, more opaque anteriorly, and 
in transverse lines; smooth but for scanty transverse microscopic 
scratches. Length 9.6, greatest diam. 1.4, anterior diam. 1, pos- 
terior .5 mm. St. Francis Island. 10 fathoms. Also Western 
Australia — (jeographe Bay, off Bunbury, 15 fathoms (type loc- 
alit\‘); also Fremantle 10-12 fathoms, very many. Species var- 
iable; mature shells may be only 5 mm. and proportionately nar- 
row, and the inflation on concave side may almost disappear. 
C. spretus Tale Sc May 1900. “The Despised Cadulus." 
Well curved, of medium proportion; variegated (in some speci- 
mens) with translucent and opaque-white rings and encircling 
bands; smooth, with fine obliquely annular grooves or lines, 
without traces of vertical striae; aperture circular, transverse; 
tube suddenly contracted quite near the oval aperture, but ex- 
hibits a slight dilation at the end. Length 5.5, diam. apex .3, 
aperture .7 mm. Cape Borda, Cape Jaffa, Beachport, 55-300 
fathoms. (Type locality — Port Esperance, Tasmania, 24 fath- 
oms). Cachthis leli^er Finlay 1926, is the Xew Zealand shell 
which vSuter in “Manual of the N.Z. Molltisca'’ had admitted in 
error as C. spretus Tate 8c Alay. At several stations \ erco dredg- 
ed a modified form of C. spretus, having at one point in its 
length a sharp annular constriction, beyond which the shell often 
has a shglrth' altered axis, and at times a somewhat different 
curve; the relative length of the two portions varies, tht earlier 
or tlic later part may form nearly the whole, or there may be 
anv intermediate proportion. 
C, gibbosus \'erco 191 1, PI. 1, fig. 6. “The Gibbous 
Cadulus.” Narrow, somewhat fusiform, polished, smooth, slight- 
])■ compressed dorso-vcntrally, smaller behind; greatest diameter 
at junction of middle and anterior third; dorsal surface obtusely 
aneled at this point; ventral surface almost uniformly convex; 
anterior end sloping forward from the convex to the _ concave 
surface, mouth rather wider than high; posterior end with a slit 
on each side, one on the convex surface and a wider curve on the 
concave; milky-wdute, somewhat obliquely striatedly painted, and 
a transverse colourless line near the posteiioi end. Length 9.7, 
greatest diam. 1.8, posterior end .45, anterior end LI mm. 300 
fathoms off Cape Jaffa (type locality). 
