some Parasitic Nematodes, 503 
equal or exceed the ventriculus in length, as it does in 
P. semiteres (fig. 5, ¢.). 
As regards the nomenclature of these two species, that for 
which the name enstcaudatum has been used may or may uot 
be identical with that named Ascaris sturnt by Gmelin, 
1790. The only indication of Gmelin’s species is the mention 
of the host, but he regarded the form from the starling and 
Porrocecum semiteres. Tail of male ; ventral view, showing 
postanal papillee. 
that from thrushes as distinct, giving them the names sturni 
and turdi respectively. If it could be definitely shown that 
the species ensicaudata and sturni are identical, then sturné 
would apparently have to be taken as the name of the 
species*. In view of the unsatisfactory definition of 
* Ascaris teres, Goeze, 1782, is a collective species, and therefore 
inadmissible, 
