Natural history . i-IIi< sii/irti/itii/rxiriiK Topsent, nat. size, p. 2:1. Fin. s«. - Longitudinal vertical section of same (x 2(i).. Antarctic (Discovery )Exp Sponges PL 22 P. Highley. London PLATE XXIII. Fid. - l>rsn«K-iilrni kiiym Iriie/isis R. & D. var. antantii-n var. n. ; a, oxea (x 1BO) ; ft, side view;ft1, front view of isochela ( X 1700); c, a variety with smaller palmate tooth (x 1700) ; J., ill, sideand front views I isurhcla from type of D. kerffuelenensis, R. & D. (X 1760); p. ?>7. FIG. 2.—Desmacidvn knyiirlrnenxis var. cactoidvs var. n. ; a, strongylate oxea ( x 160)

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Natural history . i-IIi< sii/irti/itii/rxiriiK Topsent, nat. size, p. 2:1. Fin. s«. - Longitudinal vertical section of same (x 2(i).. Antarctic (Discovery )Exp Sponges PL 22 P. Highley. London PLATE XXIII. Fid. - l>rsn«K-iilrni kiiym Iriie/isis R. & D. var. antantii-n var. n. ; a, oxea (x 1BO) ; ft, side view;ft1, front view of isochela ( X 1700); c, a variety with smaller palmate tooth (x 1700) ; J., ill, sideand front views I isurhcla from type of D. kerffuelenensis, R. & D. (X 1760); p. ?>7. FIG. 2.—Desmacidvn knyiirlrnenxis var. cactoidvs var. n. ; a, strongylate oxea ( x 160); ft, ft1, front andside views of isorhelu ( X 17lio); p. 3H. Fie. §.—Desmacidon spinigera Kirkp.; //, //, oxeas (X 160) ; c, c1, side and front views of palmate isochela(X 1760), p. 39. Fid. 4.—Desntnri.—(erntJiH-/if1,/ L;,ilH>xt/-ri Kirkp.; a, oxea (x 160); ft, c, d, f, (anonochelae, developmental forms(X 7(>0) ;/. lateral view showing lamellae (x 700); //, lateral view of side opposite to lamellae(X 7

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