PLATE II. 



rally white or blush-rose colour, with the markings crimson or red- 

 dish purple, disposed in zones, spiral circles, transverse streaks, 

 irregular waves, lines, spots, and specklings. Some are variegated 

 with different shades of brown in a similar manner. 



Fig. II. represents the natural size : Fig. III. a full grown speci- 

 men. Fig. IV. IV. IV. are elegant varieties, as they appear under 

 the microscope. Da Costa notes this species from the coast of 

 Cornwall, and from Exmouth in Devonshire. 



