?,dC> 
PROF. J. P. F. GILCHRIST ON DIMORPHISM AND 
to whether this is a case of alternation of generations, P. capensis being the 
sexual form. To ascertain this the genital pleurse of P. proliferans were 
examined by teasing, sectioning, and compression, the last-named method 
being the most suitable for examining a large number of individuals, as the 
ova are fairlj^ hirge ('12 mm.) and conspicuous. The results of the 
examination were not consistent, some having apparently no ova, some only 
a few, and some a fair number. 
.'80 
Transverse section of caudal region of the stage shown in fig. 3. 
(/o«. = g-onacls ; !n. = intestine; se^>. = seiituiu. 
^°!^- 
Fig. 7. 
^■Sep^ 
Another section of caudal region 
further haclt than that shown 
ill fig. 5. 
Transverse section of 
caudal region at the 
stage shown in fi";. 4. 
Towards the end of the summer (May) the six P. proliferans kept under 
observation had become considerably reduced in size, and a change was 
observed. The posterior region of the body became of a paler colour, the 
yellow streaks being reduced to a few scattered patches, and the intestine 
