340 CBESSWELL SHEARER, WALTER HE MORGAN, H. M. FUCHS. 
miliaris eggs fertilised with E. esculentus sperm, and 
some of the larvae were paternal, others maternal. 
From the above considerations it would seem that some 
condition in the environment has affected the E. miliaris, 
so that the eggs are unable to develop healthily when 
fertilised with sperm of the same species, and are usually 
incapable of transmitting their characters to hybrid offspring. 
Text-fig. 1. 
E . Tniliabris. E. esculentus . 
Diagram to show the characters of the late plutei of E . miliaris 
and E. esculentus. gr.p. Green pigment-mass, p.cil.ep. 
Posterior epaulette. 
II. Summary of Experiments. 
In our preliminary paper we have sufficiently indicated the 
methods which have been adopted in carrying out this 
investigation. It only remains to add here that rigid pre- 
cautions have always been taken against any possible error 
in the fertilisations. As in all our previous work proper 
controls have been kept. lu addition, our results of this year 
are not based alone upon the examination of a few culture 
jars, but on a large number of experiments extending over 
several months. 
