PLATE XXVI. 



Figures magnified f)00 diameters. 



PAGE. 



Fig. 1. XANTHIDIUM ANTJLOPAEUM, typical form, front view, . 101 



" 2. " transverse view of semi-cell, 101 



" 3. Var. polymazum, front view, . 101 



"4. " " lateral view, . . 101 



' 5. XANTHIDIUM FASCICULATUM, Var. hexagonum, . . 101 



" 6. " " lateral view, . . 101 



Figs. 7-9. XANTHIDIUM BISENARIUM, front, side and end views, . 100 



" 10-12. XANTHIDIUM ACULEATUM, front, side and end views, . 99 



" 13-15. ARTHRODESMUS RAUII, front, end and side views, . .103 



' 16-18. ARTHRODESMUS FRAGILIS, two front and one end view, 103 



" 19-21. ARTHRODESMUS CONVEROENS, two front and one end view, . 103 



" 22,23. " " variety with short aculei, . 103 



