PLATE X 



FIGURE 4a. Philodina alata, sp. n., dorsal view, feeding : the lateral processes, which 

 distinguish it from all other known species, are in this figure slightly drawn in at 

 the tips (which is accomplished by special muscles, shown in Fig. 4e). 



FIGURE 46. The same, fully contracted. The lateral processes are then turgid from 

 the pressure of the body-fluid, and are projected to their fullest extent and 

 somewhat forward. 



FIGURE 4c. The same, in the creeping attitude : usually the lateral processes are 

 drawn in, almost out of sight, among the skin-folds when creeping, but in this 

 instance they were fully extended. 



FIGURE 4c. Jaw of the same with its two teeth and wide border. 



FIGURE 4e. One of the lateral processes of the same. It is seen to be hollow, and 

 special muscles enter it and are attached near the top. One of the vibratile tags 

 is seen at the base of the process. It is unusually short and wide for a Bdelloid. 



FIGURE 4f. Foot and rump of the same seen from the side. The prominent boss of 

 the preanal segment can also be seen as a curved line in Fig. 4c. 



FIGURE 5a. Philodina antarctica, sp. n. The figure shows the prominent collar, the 

 eyes on a conspicuous brain, the elongate foot, and the peculiar spurs. The 

 basal portion of the spurs is badly drawn in this figure (it is correctly shown in 

 Fig. 56). 



FIGURE 56. Spurs of the same. These, with the broad triangular bases and peg-like 

 apices, are the best character of the species. The distinction of the two parts is 

 sometimes obliterated. Even then the absence of interspace will distinguish 

 this from P. gregaria, and there are many other differences of general propor- 

 tions and details, requiring, however, careful study. 



FIGURE 5c. Lateral view of the foot of the same. The dorsal toes are almost as thick 

 as the ventral, though shorter. This is a point of difference from P. gregaria, 

 in which the dorsal toes are relatively very small. 



FIGURE 6. Philodina, unnamed species. 



