F. H. Stewart 
•2*21 
Text-fig. 5. A larva from the lung of the rat ten days after the first 
infection and six days after the last. Total length T4 mm., length of 
oesophagus 0-227 mm., length of oesophagus/total lengtii 1/6-1. This 
was the largest larva observed in the lung. 
(1) Larva from the liver of the mouse four days after the first 
and two days after the last infection. (PI. I, fig. 2.) 
Total length 0-t43 mm., maximum breadth 0-01 mm., head to nerve ring 0-018 
mm., length of oesophagus 0-051 mm., length of oesophagus/total length 1/2-8, 
anus to tail 0-017 mm. 
Three bps. In the oesophageal region, epidermal cells form a complete sheath 
for the oesophagus representing the future longitudinal lines, nerve collar and 
excretory system. 
The ventral gland (rudiment of the excretory system) cannot be recognised 
but it is doubtless one of the larger cells of the ventral line posterior to the nerve 
ring. The body of the oesophagus is represented by two groups of nuclei (oes. and 
Fig. 5. Larva from the lung of rat D, in -.veak corrosive sublimate solution, x 102. 
oes.b.). The latter have the appearance of a rudimentary oesophageal bulb. In 
the intestinal region, all four longitudinal lines are distinguishable {V.L., D.L., 
R.L.L., L.L.L.). The ventral line is by far the most developed. The connection 
of this line with the large cells of the ventral portion of the oesophageal collar is 
quite clear. Pigment granules mark the walls of the intestine. The caudal mass 
is perforated by a rudimentary anal canal. 
(2) Larva from the lung of the mouse four days after the first 
and two days after the last infection. (Mounted in Canada balsam.) 
Total length 0-161 mm., maximum breadth 0-011 mm., head to nerve ring 0-010 
mm., length of oesophagus 0-048 mm., length of oesophagus/total length 1,3-35, 
anus to tail 0-014 mm. 
Lips are not distinguishable in the preparation. Large nuclei surround the 
oesophagus, interrupted by the nerve ring. Very few intestinal pigment granules. 
Posterior to the oesophagus thiee classes of nuclei can be distinguished: (1) those 
of the ventral line, strongly staining ami small: (2) large faintly staining 
nuclei probably belonging to the lateral line; (3) smaller faint nuclei probably 
