Plate XVIII. 



I, 6, 12, iS, 25, 26 Bfissopsis lyri/eya. 3, 23 var. capensis. 7, 8, 14 <;5a-. lyri/fray>, Simon's Bay, < Challenger^. 4, 11, 22, 27, 29 

 5/-. a//(7. 5, 9, 10, 13, 19, 20, 24 By. atlantica. 2, 15—17, 21, 28 5r. elongala. 



Fig. I. Brissopsis lyrifera, valve of globiferous pedicellaria, side view. (Comp. Fig. 25). 5%. 



— 2. — cloiigata, — - ophicephalous — ^^^li- 



— 3. — lyrifera, var. capensis, valve of globiferous pedicellaria. so/j. 



— 4, — alta, valve of triphylloiis pedicellaria. '75/^. 



— 5. — atlantica, globiferous pedicellaria, short form. 37/,. 



— 6. — lyrifera (Mediterraneau), valve of globiferous pedicellaria. /o/,. 



— 7. — ilyrifcra* (Simon's Bay, <;Challenger ), valve of ophicephalous pedicellaria. (Comp. 



Figs. 8, 14). '75/,. 



— 8. — dyrifera^y (— — — _ . _ _ side view. 



(Comp. Figs. 7, 14). '75/,. 



— 9. ■ — atlantica, valve of globiferous pedicellaria, short form. (Comp. Fig. 19). 5°/,. 



— 10. — — — - ophicephalous — '75/,. 



— II. — alta, — - triphyllous — (Comp. Fig. 4). '75/,. 



— 12. — lyrifera, — - — — '75/,. 



— 13. — atlantica (?, young specimen. Gulf Stream), valve of ophicephalous pedicellaria. '75/i_ 



— 14. — <.lyrifera'!> (Simon's Bay, Challenger;;), valve of ophicephalous pedicellaria. (Comp. 



Figs. 7, 8). '75/,. 



— 15. — elongala, valve of globiferous pedicellaria. (Comp. Fig. 21). so/,. 



— 16. — — spicules from tube-foot. '75/,. 



— 17. — — rosette-plate of frontal tube-foot. '^s/i. 



— 18. — lyrifera, spicules fiom tube-foot. '75/,. 



— 19. — atlantica, valve of globiferous pedicellaria, short form. (Comp. Fig. 9). 5°/i. 



— 20. — — globiferous pedicellaria, slender form. +71- 



— 21. — elongala, valve of globiferous pedicellaria. (Comp. Fig. 15). so/,. 



— 22. — alta, spha^ridia. '75/,. 



— 23. — lyrifera, var. capensis, upper end of stalk of globiferous pedicellaria. 3?/,. 



— 24. — atlantica, valve of globiferous pedicellaria, elongate form. 5°/,. 



— 25. — lyrifera, _ . _ — (Comp. Fig. i). so/,. 



— 26. — — globiferous pedicellaria. ^"/i- 



— 27. — alta, — — 37/j. 



— 28, — elo?igata, — — 37/,. 



— 29. — alta, valve of globiferous pedicellaria. 70/,. 



