Assertion: periwinkle's shell | /r/HasProperty | smooth
Facets:
value: in coloration
type: OTHER
value: to brownish-gray
type: OTHER
Source sentences:
text: They have a shell that is smooth and brown to brownish-gray in coloration and up to about 1 inch long.
text: The adult common periwinkles have a shell that is smooth; however, the young ones may have ridges on their shell which spiral up towards the apex.