PLATE XXIII. 



Fig. 1. — Desmacidon Icerguelenensis E. & D. var. anta/rctica var. n. ; a, oxea ( x 160) ; 6, side view ; 

 J}^, front view of isochela (x 1760) ; c, a variety with smaller palmate tooth (x 1760) ; d, d^, side 

 and front views of isochela from type of D. hergmlemnsis, R. & D. ( x 1760) ; p. 37. 



Fig. 2. — Desmacidon Icerguelenensis var. cactoides var. n. ; a, strongylate oxea (x 160) ; &, V-, front and 

 side views of isochela ( X 1760) ; p. 38. 



Fig. 3. — Desmacidon spiiiigera Kirkp. ; a, b, oxeas ( X 160) ; c, c^, side and front views of palmate isochela 

 (X 1760), p. 39. 



Fig. 4. — Desmacidon maeandrina Kirkp. ; a, oxea (x 160) ; l-h^, ancorae unguiferae (x 700) ; p. 40. 



Fig. 5. — Cercidochela lanhesteri Kirkp. ; a, oxea ( X 160) ; h, c, d, e, canonochelae, developmental forms 

 ( X 700) ; /, lateral view showing lameUae ( x 700) ; g, lateral view of side opposite to lamellae 

 ( X 700) ; h, back view, i.e., of the shaft, showing straight line of axial canal within the right 

 edge ( X 700) ; Jc, half of a spicule broken across ( x 700) ; I, end view ( x 700), p. 42. 



Pig. 6. — Boplakiihara dendyi Kirkp.; a, oxea (x 160); ft, spherostyles (x 160); b^, spines on head 

 of & ( X 700) ; S^, end view of a spine ; c, c^, c^, side, front, and back views of a fimbriated 

 placochele, p. 44. 



