| 11. | Rostral S ! the length of the shielded part of the head.
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| 12. | Nasals broadly in contact with each other behind the rostral.
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| 13. | The rostral scale is broad, sometimes pointed or upturned.
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| 14. | The head is black from the rostral to just behind the eyes.
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| 15. | Rostral nearly twice as broad as deep, just visible from above.
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| 16. | Rostral very large with obtuse horizontal edge, flat below.
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| 17. | Rostral slightly broader than high, barely visible from above.
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| 18. | Rostral very large, extending posteriorly far beyond the eyes.
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| 19. | Portion of the rostral visible from above broader than long.
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| 20. | The pituitary gland is formed within the rostral neural plate.
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