390 
MOLLUSC A. 
Vole aria cylindrica. — The Cylindric Volvaria. 
Plate LXXXIV. fig. 11. 
Shell cylindrical, white, with one plait on the columella. 
Half an inch long. Inhabits the British seas. 
Genus 8.—MARGXNELLA.— Lamarck. 
Generic Character. — Shell oblong-ovate, smooth ; spire short, 
outer lip with a marginal longitudinal varix; base slightly 
notched ; columella plicated ; folds nearly equal. 
Section I.— Spire prominent. 
Marginella ccerulescens. —The Bluish Marginella. 
Plate LXXXIV. fig. 6. 
Shell bluish-white ; spire short, and acute; lip brownish 
purple within; columella with four plaits. One inch long. 
Inhabits the Indian ocean. 
Section II.—Spire depressed. 
Genus 9.—VOLUTA.— Linnaeus. 
Generic Character. — Shell ovate, more or less ventricose ; 
apex papillose ; without a canal ; columella plicate, the lower 
plaits larger and more oblique than the others; without colu- 
mellar laminae. 
This genus is divided into four sections.—1. Shell ventri¬ 
cose ; 2. shell ovate, spinous, or tubercular ; 3. shell oval, and 
subtubercular; 4. shell elongated, ventricose, nearly fusiform.— 
The following illustrates section 2. 
Valuta vespertilio .— The Bat Volute. 
Plate LXXXIV. fig. 7. 
Shell emarginated with acute spines on the volutions ; summit 
slightly obtuse ; columella four plaited. Three inches long. 
Inhabits the Indian seas. 
Genus 10.—MITRA.— Lamarck. 
Generic Character .—Shell turreted, or sub-fusiform, with 
an acute spire ; base emarginate, without a canal ; columella 
