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1 3 0 MOLLUSCOUS A N IM A L S .
T he shell is more than h a lf immersed in the middle o f th e foot, an d it is this immersion which causes it
to have the polished coat. Most of the large species have no operculum, b u t tbe smaller species often have
an oblong, horny one, which is nearly as long as the ir m o u th ; this is particularly the case with O. zonalis,
O. semistriata, O. conoidalis, where the operculum is bright sea green.
The olives live buried in the sand, and are generally taken by fishing for them with lines baited with
flesh. According to M. Quoy, these animals are exceedingly active, and they have the power of regaining
their p rope r position even when they are laid upon the ir backs.
The inne r whorls are absorbed exactly as in the Cones. The pillar is very tortuous and thin ; and the
apex is filled inside with a glossy deposit.
The distinction of the species o f the olives is a ttended with very great difficulty. I t appears tha t Linnteus
made too few, and th a t Lamarck and succeeding authors have gone to the other extreme and made too many.
T he ir arrangement might be facilitated by dividing them into sections, thus,
They have all a be lt in fro n t o f the last whorl over the canal. Some have a second be lt behind this, as
O. utriculus, O. clavula, O. gracilis, O. undate lla, O. acuminata, O. suhulata, and O. leucozonias. B u t m ost
are without this belt. Most of them have the inne r lip even, as O. p o rp h y ria , O. semistriata, O. Brasiliensis,
&c. B u t some have two callosities on the ir lip as 0 . undate lla, and its variety 0 . bifasciata.
The operculum of O. eburnea is green w hen fresh, it is ovate, lanceolate, and with the nucleus very slightly
curved and spiral, so th a t i t very nearly resembles the operculum o f a L itto r in a , b u t the nucleus is n ot spiral.
The scar of attachment for a hand nearly the shape o f the operculum b u t ha lf its b readth is along the straight
side.
O l iv a g r a c i l i s , t. 3 6 . / . 2 1 .— B r o d 8r Sow. Zool. Jour. iv . 3 7 9 .
Shell oblong, subcylindrical, white, varies in the irregular brown spots ne a r the suture, and ne a r the
anterior h e lt o t the la s t w horl. Spire conical, con v ex ; suture d is tin c t; anterior be lt about one-third the
breadth of the last whotl, marked with a spiral groove on its h inde r margin. Mouth lanceolate, w ide in front,
with eight o rn in c o b ic u te folds, in n e r lip thickened, and the callosity behind extending to the last whorl but
one. Axis 85 ; diam. 3 ; mouth 5 lines.
Differs from 0 . nivalis in its colour and in the b e lt b e ing divided into two by a groove.
O l iv a l e u c o z o n ia s . t. 26. f . 2 4 .
Shell ovate, fusiform, slender, polished, pale brown, dotted with a white spiral band ne a r the suture and
the back edge of the hinder anterior be lt. B e lt and suture b la ck ' s p o tte d ; spire acute, ha lf as long as the
mouth. Mouth narrow, pilla r o b liq u e lypla ited, front of pillar callous. Axis i inch.
Inhab.
O l iv a s e m i s t r ia t a . t. 3 6 ./ . 1 0 .
Shell ovate, lanceolate, bluish grey ; spire conical, acute, rather produced, smooth, with an obscure band
near the s u tu r e ; last whorl closely concentrically striated on the h inde r half, with a white central b a n d ;
anterior belt, narrow, white. Mouth lanceolate ; outer lip expanded in f ro n t; inne r lip callous, extending up
to the u p p e r suture, with an obscure oblique fold, producing a single protuberance in f ro n t; canal wid e ;
throat b la c k ; operculum homy, lanceolate. Axis 9 ; diam. 3 i ; mouth 6 lines.
Var. 2. LU T EA .
Shell yellow-brown, with a whitish band ne a r the suture, and another in the centre of the last whorl not
so distinctly lined near the suture.
MOLLUSCOUS A N IM A L S . 1 31
O l i v a z o n a l i s . t. 3 6 . / . 25.—Lam. H ist. 4 3 9 . n. 6 1 .
Shell ovate, fusiform, polished, pe lluc id w h ite ; spire conical, a c u te ; last whorl with two black and one
central fulvous spiral band. Mouth linear, ovate, rather less than twice as long as the spira l c o lum n ; lip
thickened, with a single oblique fold in front, and a black spot behind n e a r the su tu re ; the anterior belt
narrow. Axis 2 ; diam. i ; mouth l i lines.
O l i v a u n d a t e l l a . t. 3 6 . / . 2 3 , 277.— Lam. H is t. vi. 4 3 8 .
Shell ovate, oblong, brown, with black undulated b a n d s ; spire conical, convex, apex produced, acute,
with a narrow articulated brown and yellow band round the s u tu r e ; anterior belt broad, occupying more than
one-third o f the last w h o r l; behind yellow, with brown concentric lines, with two oblique spiral grooves in
front, ju s t over the canal. Mouth linear, inne r lip thickened to the suture behind, with transverse grooves
before, with four or five very oblique grooves. Axis 7 ; diam. 3 ; mouth 6 lines.
Var. 2. U NDATA. t . 3 6 . / . 2 6 .
Shell pale p in k ish ; body of the last whorl with wavy concentric bands placed in three se rie s ; front of
columellar lip brownish, sometimes a few brown waves on the anterior belt.
Var. 3 . N iT iD A .
Shell white, with irregular b lack spots and lines, some o f which are seen on the inside o f the shell.
O l i v a a u r i c u l a r i a . Lam.—Guerin. Icon.—Mott. t. 1 6 . / . 1 3 .
Oliva patula. Sow;. T. C. 2 3 3 1 .
In h ab . Pacific Ocean.
O L IV A L IN EO LA TA .
Voluta lineolata. Gray. Wood. Sup. t. 5. / . 3 7 .
Inhab. Coast of Pe ru?
O l i v a n a n a . Lam. 4 3 8 . n. 6 0 .
There are three very distinct varieties o f this species ; the first figured b y Lister, t. 733. / . 22. is o b co n ic ;
spire w h ite ; body whorls yellow, with zigzag brown lines in fro n t; yellow and rounded behind. The second
variety is ovate, slender, coloured like the last. And the third is of the same shape as the former, b u t the
shell is minutely brown speckled with a series of b la ck spots near th e suture, and th e front o f the pilla r is
brown. So distinct as these varieties appear, it is n ot difficult to firid specimens intermediate between each
o f them.
O l i v a v o l u t e l l a . Lam. 472.— Wood. Sup. t. 4 . / . 3 6 .
T here were b rought home by the expedition some specimens o f this shell, o f a d a rk purple black colour,
w ith the back edge o f the anterior be lt pale.
A GA RO NIA .
T he genus appears to he intermediate between tlie Olives and the AncillarUe, for it has the twisted
columella and the wide mouth o f the latter, and the grooved suture o f the Olive; b u t the animals offer the
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