Vlll 



LIST OF THE PLATES. 



PLATE CVI. 



Figs. 1-4. Xanthidium armatum 



(p. 51) 

 ,, 5-11. X. subhastiferum (p. 



'56) 



PLATE CVIL 



Figs. 1-4. Xanthidium tetractn- 



trotum (p. 58) 

 ,, 5-8. X. controversum\(p. 



59) 



910 X. subhastiferum (p. 

 56) 



PLATE CVIII. 



Figs. 1-6. Xanthidium Smithii 



(p. 61) 



,, 7-19. X. antilopsBum (p. 

 63) 



PLATE CIX. 



Figs. 1-7. Xanthidium ant Ho - 

 p&iuu (p. 63) 



PLATE CX. 



Figs. 1-7. Xanthidluin antilo- 



p&um (p. 63) 

 ,, 8-12. X. cristatum (p. 70) 



PLATE CXI. 



Figs. 1-5. Xanthidium cristatum 



(p. 70) 

 ,, 6-9. X. fasciculatum (p. 



75) 

 10. X. Smithii (p. 61) 



PLATE CXII. 



Figs. I-4s.Xanthuliuni Brebis- 



sonii (p. 77) 



5-9. X. aculeatum (p. 78) 

 ,, 10-12. X. concinnum (p. 86) 



PLATE CXIII. 



Figs. 1-7. Xanthidium variabile 

 (p. 81) 



PLATE CXIII continued. 



Figs. 



8. X. Robiiisonianum (p. 



83) 

 ,, 9. X. apiculiferum (p. 



85) 



10-12. X. Orcadcnse (p. 84) 

 ,, 13-24. Arthrodesmus Incus 



(p. 90) 



PLATE CXIY. 



Figs. 1-10. Arthrodesmus Incus 



(p. 90) 



11-17. A. triangularis (p. 

 97) 



Figs. 



PLATE CXV. 



1-5. Arthrodesmus trian- 

 gular is (p. 97) 

 ,, 6-7. A. quiriferus (p. 101) 

 8-11. A. crassus (p. 102) 

 ,, 12-14. A. cntitroversus (p. 



103) 



15-17. A. phimus (p. 104) 

 ,, 18. A. quiriferus (p. 101) 



PLATE CXVI. 



Figs. 1-3. Arthrodesmus Buln- 



heimii (p. 105) 



,, 4-13. A. convergens (p. 106) 

 ,, 14. A. su^ulatus (p. 109) 



PLATE CXVIL 



Figs. 1-5. 



6-10. 



11-16. 



17. 



18-20. 



21. 



22. 



23-24. 



-Arthrodesmus subu- 



latus (p. 109) 

 A. octocornis (p. Ill) 

 -A. bifidus (p. 113) 

 -A. trispina,tus($.\\&) 

 A. tenuissimus (p. 



116) 



-A. octocornis (p. Ill) 

 -A. phimus (p. 104) 

 Xanthidium actdea- 



tum (p. 78) 



Figs. 



PLATE CXYIII. 



1-3. Xanthidium Robin- 

 sonianum (p. 83) 



