772 
Jour nal of Agricultural Research 
Vol. XXX, No. 8 
SUMMARY AND CONCLUSIONS 
The principal facts presented in the 
foregoing pages may be summarized as 
follows: 
Ascaridia lineata is the common in¬ 
testinal- roundworm of chickens in the 
United States, the occurrence of A. 
perspicillum in this country not having 
as yet been established on the basis of 
morphological comparisons of Ascaridia 
occurring in American chickens with the 
different forms that have been de¬ 
scribed as A. perspicillum. 
So far as can be judged from the 
various illustrations of Ascaridia per¬ 
spicillum, this species is either highly 
variable as regards the arrangement 
and location of the papillae in the tail 
of the male, or else several different 
species have been confused under one 
name. 
Ascaridia lineata exhibits consider¬ 
able individual variations, these being 
correlated with size and therefore with 
age of the different specimens. Of 
special interest in this connection is the 
variation in the length of the spicules, 
organs to which considerable specific 
importance is usually assigned by 
helminthologists. Of perhaps equal 
importance is the variation in the size 
of the sucker, which has a chitinized 
rim. 
Ascaridia lineata is recorded for the 
first time as a parasite of the goose, on 
the basis of specimens from Indo- 
China. 
In view of the apparent absence of 
Ascaridia perspicillum from American 
chickens, various facts published in the 
United States concerning the life his¬ 
tory, pathology, and physiology of 
A. perspicillum as well as facts per¬ 
taining to medicinal treatment in all 
probability refer to Ascaridia lineata. 
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