Across
- 3. incomplete rings of heavy cartilage
- 5. also known as #9
- 8. small, platelike sheets of epithelial folds
- 11. the ______ #10 are located on the other end of #9
- 12. #8 is made up of rows of these tiny plates
- 13. fan out laterally from #3
Down
- 1. also known as #8
- 2. short, spikelike projections from #3
- 4. also known as #5
- 6. two #7 form the gill unit or ___
- 7. #8 are arranged in half gills or ___
- 9. the area between #10 and #11
- 10. located at the anterior of the trunk