6 
Annals of the Transvaal Museum. 
on the ventral side of the anterior border, where there are usually at each 
side two characteristic spines, one of which points forward and the other 
backward. 
The main row and the lateral spines on the central trunk are the only 
processes which are quite normal. All the forms known to me have ten 
spines in the main row, but Lord (17) says there are only eight in C. 
cataracta, and Weber figures only seven. 
There is commonly one row, and sometimes two rows, of spines on 
the central trunk after the main row. This species has none of those. 
On the apparent preanal segment there are four warts, the dorsal pair 
of which correspond to those which are usually the last on the body. 
The anal segment has also four knobs, which do not occur on any 
other known form. 
The spurs differ from all the other forms. In most they are small 
and slender, with or without an interspace (Weber figures the type without) 
and are held almost parallel. P. africana has them very short and rounded, 
divergent, and with a wide interspace. 
The characters of the spurs, and the great cones on the neck, were 
the features which chiefly decided me to separate P. africana from 
P. brycei. 
Habitat. — Pretoria, collected by J. Hewitt : numerous. 
Callidina habita Bryce (4). — Two varieties were noted, besides the type. 
First (Plate I, figs, la-lb). — Large, differing from the type in three 
particulars — the corona is broader, and the lobes of the upper lip are 
widely separated by a straight interspace; the boss of the foot is quite 
at the end of the first segment of the foot, instead of a little way above 
the end ; the spurs are separated by a broad straight interspace. 
Second (Plate I, figs. 3a-3b).— smaller, head and upper lip as in the 
type, lobes meeting in median line; anal segment expanded at its end 
into a sort of thin flange; spurs very small, very widely separated by a 
straight interspace, with a minute nick in the median line. The foot 
appears to be only three-jointed. One example of this variety contained 
an elliptical thick-shelled egg, without the poles produced. It often 
swims free and rotates on its long axis. There is no foot-boss. 
Very probably both of these are distinct species, but they are obviously 
very close to habita, and are united with it pending further study. C. habita 
is not a very variable species, but it is known to vary in the direction of 
having the lobes of the upper lip separated, the spurs separated, and the 
foot-boss obsolete. 
C. formosa Murray (24). — This agreed with the form in tropical Africa 
in having the foot and anal segment smooth, and the papillae on the 
preanal very small. 
Callidina bullata , sp. n. ; synonym, Callidina habita Bryce, var. 
bullata Murray (23) (Plate II, figs. 10a-10c). 
Specific characters . — Size moderate ; hyaline, except alimentary canal ; 
stoutish, trunk broader than corona. Collar prominent, corona wider 
than collar, discs with central papillae and setae ; lobes of upper lip 
rounded, meeting in middle line. Antenna short. Teeth, two in each 
