![Outlines of zoology. rt protective. The mucus chieflyconsists of strange spiral threads which uncoil when ejectedfrom the sacs. The zigzag muscle segments or myomeres are traceable.The rasping teeth are worked by Outlines of zoology. rt protective. The mucus chieflyconsists of strange spiral threads which uncoil when ejectedfrom the sacs. The zigzag muscle segments or myomeres are traceable.The rasping teeth are worked by](https://c8.alamy.com/comp/2AGDJ86/outlines-of-zoology-rt-protective-the-mucus-chieflyconsists-of-strange-spiral-threads-which-uncoil-when-ejectedfrom-the-sacs-the-zigzag-muscle-segments-or-myomeres-are-traceablethe-rasping-teeth-are-worked-by-a-powerful-muscularstructure-sometimes-called-a-tongue-a-sectionof-this-shows-a-strong-muscular-cylinder-surrounding-acartilage-5i8-cyclostomata-the-skeletonthe-skeleton-is-wholly-cartilaginousthe-notochord-persists-unsegmented-within-a-firm-sheaththe-skull-is-a-simple-unroofed-trough-jaws-are-notdistinctly-developed-there-is-only-a-hint-of-the-complicatedbasket-work-which-2AGDJ86.jpg)
Outlines of zoology. rt protective. The mucus chieflyconsists of strange spiral threads which uncoil when ejectedfrom the sacs. The zigzag muscle segments or myomeres are traceable.The rasping teeth are worked by
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