| 11. | Inserting directly behind this sclerite, on the head shield proper, are two stout antennae.
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| 12. | The most conspicuous feature is the hexagonal head shield that carries 6 ray-like spines ..
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| 13. | The head is large and robust with a complete head shield that does not approach the ears.
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| 14. | Another unusual clade of trilobites known as the trinucleids developed a broad pitted margin around their head shields.
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| 15. | A fleshy appendage emerged laterally on each side, behind the head shield, functioning as pectoral fins.
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| 16. | Specimens also show some bulbous formations at the front of the head shield that may have served as eyes.
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| 17. | To date only the creature's armored head shield ( a typical trait for osteostracids ) has been found.
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| 18. | The body of " Molaria " consisted of a head shield ( antennae was present on the cephalon.
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| 19. | The head shield provided some lift though, and would have made the cephalaspidomorphi better swimmers than most of their contemporaries.
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| 20. | Specimens of " Yohoia " have a head shield which is followed by 13 trunk tergites, or plates.
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