Plate XVIII. 



I, 6, 12, iS, 25, 26 Bi'issopsis lyi'ifeya. 3, 23 var. capensis. 7, 8, 14 <iBr. lyyiferai>, Simoii's Bay, »Challeuger >. 4, 11, 22, 27, 29 

 Br. alia. 5, 9, 10, 13, 19, 20, 24 By. atlaniica. 2, 15—17, 21, 28 5r. elongata. 



Fig. I 



— 2 



— 3 



- 4- 



- 5' 



— 6. 



- 7' 



— 9 



— 10. 



— II 



— 12. 



— 13' 



— 14 



— IS 



— 16, 



Brissopsis lyrifera, valve of globiferous pedicellaria, side view. (Comp. Fig. 25). 5°/^. 



— elongata, — - ophicephalous — '75/^. 



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



— æ/^«, valve of triphyllous pedicellaria. '75/,. 



— atlaniica, globiferous pedicellaria, short form. 3?/,. 



— lyrifera (Mediterranean), valve of globiferous pedicellaria. 7°/,. 



— 'dyrifera!> (Simou's Bay, «Challenger >), valve of ophicephalous pedicellaria. (Comp. 

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



— dyrifcra-!> (_ _ _ _ . _ _ side view. 

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



— atlaniica, valve of globiferous pedicellaria, short form. (Comp. Fig. 19). s«/,. 



— — — - ophicephalous — '75/,. 



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



— lyrifera, — - — _ '75/,. 



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



— dyrifera-h (Simon's Bay, < Challenger*), valve of ophicephalous pedicellaria. (Comp. 

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



— elongata, valve of globiferous pedicellaria. (Comp. Fig. 21). 50/,. 



— — spicules from tube-foot. '75/,. 



— — rosette-plate of froutal tube-foot. '^5/,. 



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



— atlaniica, valve of globiferous pedicellaria, short forui. (Comp. Fig. 9). 50/,. 



— — globiferous pedicellaria, slender form. +71. 



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



— alta, sphæridia. '75/,. 



— lyrifera, var. capensis, upper eud of stalk of globiferous pedicellaria. 37/,. 



— atlaniica, valve of globiferous pedicellaria, elongate form. 50/,. 



— lyrifera, _ . _ _ (Comp. Fig. i). 5°/,. 



— — globiferous pedicellaria. 271- 



— 17 



— I 



— 19' 



— 20. 



— 21 



— 22 



— 23 



— 24 



— 25 



— 26. 



— 27 



— 28, — elongata, — • — 37/,. 



— 29. — alta, valve of globiferous pedicellaria. 7°/, 



alta, — — 37/j. 



