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EXPLANATION OF PLATE I. 
Fig. la. Callidina habita Bryce; variety with lobes of upper lip separated. 
16. The same ; side view of foot. 
2a. Pleuretra africana Murr. 
26. The same ; jaw. 
2c. The same ; the neck lobes approximated. 
2d. The same ; anterior ventral margin of trunk. 
2e. The same ; spurs. 
за. C. habita ; variety having anal segment expanded at the posterior end. 
зб. The same ; spurs. 
4. C. aculeata Milne ; form with many blunt knobs, and lateral setae on the rump. 
5. The same ; form with many spicules, and no lateral setae. 
ба. The same ; form with few spicules ; ligule between discs. 
бб. The same ; jaw. 
6c. The same ; spurs. 
