Insects and Parasitic Diseases, 65 



and in H. nmscae and H. microstoma directly intoi the stomach. As 

 seen by coujparing Figs. Id and 4 of H. muscae and Figs. 18d 

 and 20 of H. microstoma, the former in each case being that of 

 embryos still within the egg-shell as extruded from the female and 

 present in the stomach contents, the latter being the first stage 

 obtained from a larva in each case, very little development goes 

 on after emergence from the egg-shell, either in the stomach or 

 intestines, or in the faeces, i.e., until the helminth larva enters its 

 new intermediary host. In the case of H. megastoma the young 

 embryo enclosed within the egg shell is seen in Fig. 36f, but unfor- 

 tunately a young larva comparable with Fig. 4 of H. muscae and 

 with Fig. 20 of H. microstoma has not been found in the case of H. 

 megastoma. 



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