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- In the longest specimen (53 mm.) the cephalic extremity is bluntly 
rounded; 80 yw caudad of the mouth 
it is 128 in diameter; it swells 
gradually to 368 yw in diameter a 
short distance caudad of the posterior 
I end of the esophagus. 
5 In the specimen 44 mm. long, the 
diameter is 160 yw at a point 80 yu 
back of the mouth; the maximum 
diameter is 560 ju. 
In the specimen 37 mm. long, the 
diameter 80 yw back of the mouth is 
136 /^; at 800 yw back of the mouth the 
diameter is 272 yu; ].6 mm. back of 
the mouth the diameter is 368 yw; the 
increase is then rather gradual, and 
at the end of about the first third of 
the specimen the diameter attains 
560 yw; then a diameter of 576 is 
retained more or less uniformly, but 
with a slight variation, at some points 
reaching 624 yw; toward the tail, the 
diameter begins to decrease, at first 
slowly, then more rapidly; at 1.6 
mm. from the tip, it is 400 yw; at 800 
ywit is 272 /^(dorso-ventral diameter); 
at the anus the dorso-ventral diame- 
ter is 120 the tail then ends rather 
bluntly. 
In a mounted specimen 32 mm, 
long, the diameter 80 pt back of the 
mouth is 128 yu; at 800 yu it is 240 pi; 
just before the end of the esophagus 
it is 432 yu; just back of the esopha- 
gus there is a slight constriction, to 
400 yu; it then varies between 560 and 
640 yu for the greater part of the 
length; near the tail it begins to de- 
crease, reaching 432 yu at a point 
1.6 mm. from the tip; it now de- 
creases more rapidly, reaching 240 yu 
at a point 800 yu from the tip; at the 
anus, the dorso-ventral diameter is 
^ 80 yU. 
In general, the body may attain 
a maximum diameter of about 560 
to 640 yw and is more or less uniform for a considerable part of its 
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