| Answer | Crossword Clue |
|---|---|
| periostracum | the horny outer layer of a mollusc's shell |
| Answer | Crossword Clue |
|---|---|
| periostracum | the horny outer layer of a mollusc's shell |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.