132 Sch istosoma japonicmn 
spine of 8. japonicum, as depicted by Dr Leiper, is a distinctive 
characteristic we should have been able to recognize it in the present 
series of examinations, even though we had overlooked it in an equally 
large number of examinations upon which our original measurements 
were based. 
With regard to the similarity of these ova and those of Agchylostoma 
duodenale : the ova of the latter are more nearly ovoid while those of 
S. japonicum are somewhat flattened, so that we would hardly speak of 
rolling them under the cover glass but rather of turning them over. 
