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DESCRIPTION OF TWO APPARENTLY NEW 
SPECIES OF GENUS ANCILLARIA. ZAM. 
By W. F. Perrerp, C.M.Z.S. 
[Read September 7, 1885. | 
AncILuARIA Fusirormis, n. sp. Shell fusiform, somewhat 
thin, white to pale chestnut, shining; spire produced milky- 
white with thin layer of callous, spirally striated above and 
below the suture, which is margined below with a broad zone 
of the same appearance, bounded with a distinct spiral line ; 
base of body-whorl milky-white, bilined; columella thinly 
callous, extending on to body-whorl, obliquely striated at 
base; aperture elongately orate; outer lip thin. 
Long. 20; lat. 9 mil. Apert. long. 10; lat. 4 mil. 
Hasirat.—Swan Island, Bass’ Straits. 
This shell is much smaller and more fusiform than its 
nearest ally A. Marginata Lam or its var. Tasmanica T. Woods; 
it also differs in colour and general structure. So far I have 
only obtained it from the locality given, but in all probability 
its range extends to the other islands in the vicinity or even 
to the mainland. The examples are not in very good con- 
dition, but quite sufficient to show its distinct specific 
characters from the more widely distributed and abundant 
form. Like the olives, all the species are much of the same 
structure, but, unlike that genus, they are very constant in 
specific characters. 
ANCILLARIA Oxptusa,n. sp. Shell ovate, thick, shining, 
white to pale fulvous ; whorls about 5; svire short, rounded, 
lined, covered with a thick callous deposit, apex obtuse, 
blunt ; body-whorl margined above and below with a broad 
milky zone, and lined at the base; columella with a thick 
layer of enamel extending on to the body-whorl, perceptibly 
wriukled and twisted at the canal; outer lip thin, acute. 
Long. 17; lat. 8 mil. Apert. long. 105; lat. 4 mil. 
Hasrrat.—North-West Coast. 
This is comparatively a small stout form, with a short 
swollen and rounded spire, caused by its rather thick deposit 
ofenamel. It is very distinct from the preceding specie, and 
equally constant in form, colour, and general structure. I 
submitted examples to Professor Tate’s critical examination, 
atid his opinion is that it is quite separate from our other 
species. From its small size it has probably been passed 
over asa stunted var. of A. marginata. Like many of our 
more recently discovered species it appears to be local 
in habitat, although not by any means rare, in favourable 
localities, between Tamar Heads and Table Cape. 
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