ADDEIsTDA. 
Since the manuscript of this bulletin left our hands, a number of 
additional references to trematodes have come into our possession. 
Only such references as involve new names and new combinations 
will be inserted in the addenda. 
Particular attention is invited to an important change in the In- 
ternational Code relative to the collective groups, namely : 
Art. 8. — Recommendation : Certain biological groups which have been pro- 
posed distinctly as collective groups, not as systematic units, may be treated 
for convenience as if they were genera, but they require no type species. Ex- 
amples: Agamodistomiim, Amphistomulum, Agamofilaria, Agamomermis, Spar- 
ganum. 
In the present bulletin, types were designated for certain of these' 
groups before the foregoing article tvas adopted. Such designation 
becomes null and void under this article. 
(385) 
