xii A SYNOPSIS OF 



24. BUCCINUM. 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 back- 

 wards : pillar-lip expanded. 



25. STROMBUS. Plate 24. 

 Animal, a Limax. 



Shell, 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. 



