PLATE XXIIIa. 
Fig. 1. Portion of a bristle, from the inferior tuft of the second foot of 
Trophonia capensis, . . . . . x 116. 
Fig. 2. Hook, from the ventral tuft of the tenth foot of the same, . . x 90. 
Fig. 3, Posterior bristle with hooked tip, from the foregoing, . . x 55. 
Fig. 4. Portion (near the tip) of a superior bristle, from the tenth foot of 
Trophonia herguelarum, . . . . . x 350. 
Fig. 5. Hook, from the lower border of the tenth group of the same, . x 90. 
Fig. 6. Upper hook, from the same series, . . . . . x 90. 
Fig. 7. Portion of one of the larger frontal bristles of Brada inammillata, 
with parasitic Infusoria, . . . . . x 90. 
Fig. 8. Ventral hook, from the tenth foot of the same, . . . x 90. 
Fig. 9. Basal region of one of the anterior bristles of Brada ivhiteavesii, . x 350. 
Fig. 10. Anterior hook of the foregoing, . . . . . x 90. 
Fig. 11. Portion of the basal region of a dorsal bristle, from the first foot 
of Trophonia wyvillei. The proximal end is inferior, . x 90. 
Fig. 12. Portion of the slender distal region of the same bristle where the 
striae are evident, . . . . . . x 90. 
Fig. 13. Bristle, from the ventral series of the tenth foot of the foregoing, x about 40. 
Fig. 14. Tip of one of the same series, . . . . . x 90. 
Fig. 15. Extremity of a bristle, from the first series of . x 350. 
Fig. 16. Portion from the middle of one of the smaller forms from the 
same group, ....... x 350. 
Fig. 17. The same region of the bristle so as to show the length of the 
divisions on each side of the transverse bar, . . . x 55. 
Fig. 18. Tip of one of the ventral bristles from the foregoing, . . x 350. 
Fig. 19. Group of the fourth series of bristles in Ranzania capensis^ . x 350. 
Fig. 20. Bristle with expanded tip, from the same foot, . . . x 350. 
