Today I participated in an English contest. The fourth subject asked us to translate a text into our language. The text had some expression I didn't know and I wonder what does this one mean:
“The boy came close and peered down at Ralph, screwing up his face as he did so. What he saw of the fair-haired boy with the creamy shell on his knees did not seem to satisfy him.” (Golding, William — The Lord of the Flies)
So, what does "creamy shell" mean here? I know shell means the "house" that a snail has on his back or shells from the beach.