. Journal of morphology . Fig. 2. I* ?%„ f. Fig. 3. Fig. 4 Plate 5. Dorsal aspect of adult 5 CJia-toptenis. (From preserved specimen.)X %•Fig. G. Ventral aspect of same specimen, x %• Fig. 7. Model of accessory feeding-organ of the 13th segment. X 3. Fig. S. Posterior aspect of partially sexual segment of adviltChatoptcriis. Ventral side uppermost, x !%? Fig. 9. Ventral aspect of larva of (JJiaiopteriis. (Drawn from life.)Six days old. 1 mm. long, x ^3- Fig. 10. Ventral aspect of larva of CIi at opt eras at beginning of the trans-formation. (Drawn from life.) mm. long, x

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. Journal of morphology . Fig. 2. I* ?%„ f. Fig. 3. Fig. 4 Plate 5. Dorsal aspect of adult 5 CJia-toptenis. (From preserved specimen.)X %•Fig. G. Ventral aspect of same specimen, x %• Fig. 7. Model of accessory feeding-organ of the 13th segment. X 3. Fig. S. Posterior aspect of partially sexual segment of adviltChatoptcriis. Ventral side uppermost, x !%? Fig. 9. Ventral aspect of larva of (JJiaiopteriis. (Drawn from life.)Six days old. 1 mm. long, x ^3- Fig. 10. Ventral aspect of larva of CIi at opt eras at beginning of the trans-formation. (Drawn from life.) mm. long, x 31. Fig. 11. Ventral aspect of larva of Chcetopterus at the time of the trans-formation from free-swimming to creeping stage. (Drawn from life.) 2 X 23. Fig. 12. Same larva. Dorsal aspect. Post-oral lobe extended, x 23. Fig. 13. Same larva. Viewed from left side. Post-oral lobe 23. Fig. 14. Posterior end of adult Glurtopterus. Shows regeneration of thesexual segments. X 5- Life Histoiy and Habits olChacto/iteru.

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