XU A SYNOPSIS OF 



24. 8UCCINUM.— Plate 22. 

 Animal, a Limax. 



Shell, univalve, spiral, gibbous; aperture ovate, ending in a short 

 canal leaning to the right, with a beak or projection turned 

 backwards: pillar-lip expanded. 



25. STROMBUS.— Plate 24. 

 Animal ', a Limax. 



Shelly univalve, spiral, ventricose ; aperture dilated and terminating 



in a canal leading to the left : outer lip mostly expanding with 



age into a wing, or into long and pointed claws. 



26. MUREX.— Plate 25. 



Animal, a Limax. 



Shell, univalve, spiral, oval, or oblong ; channeled at the base ; 

 canal strait and entire, sometimes slightly reflected. Externally 

 studded with spines, tubercles, or folds. 



27. TROCHUS.— Plate 28. 

 Animal, a Limax. 



Shell, univalve, conical, spiral ; aperture more or less angular, trans- 

 versely contracted : pillar placed obliquely. 



28. TURBO.— Plate 30. 

 Animal, a Limax. 



Shell, univalve, spiral, solid ; aperture contracted, orbicular, entire. 



29. HELIX.— Plate 32. 

 Animal, a Limax. 



Shell, univalve, spiral, subdiaphanous, brittle ; aperture entire, con- 

 tracted, semilunar or roundish. 



