I 
16 
A distinct longitudinal striation is visible upon microscopic examina- 
tion; this is due, not to any striation in the cuticle but to the longi- 
udinal somatic muscles. 
Loxgitudixal lines. — The lateral bands are prominent, but exter- 
nally the dorso- and ventro- median bands are barely recognizable; 
the position of the latter may, however, be distinguished externally, 
midway between the lateral bands, as longitudinal lines, at which the 
somatic muscles are thinner than usual, and in fact at which the 
respective muscle cells are slightly interrupted: the median lines may, 
however, be described as practically invisible externally: on section 
they are seen to be very narrow centrifugallv, but slightly broader 
centripetally. 
Lateral l)ands . — The lateral bands may be traced the entire length of 
the worm, from a point immediately back of the latero-median papillie 
Figs. 7-9. — Enlarged ventral (7) and lateral (8 to 9) views of the tail. Xote the transverse striation 
in the post-anal portion: the broad transverse anal slit; the nddgut is large, but the rectum is 
compressed dorsoventrally; the lateral band, ■with numerous nuclei, is prominent: various cells, 
nuclei, and muscles are seen. 
at the anterior end to the end of the tail: in the esophageal region they 
are somewhat less distinct than in the midgut region. Very close to 
the mouth, in one specimen, the lateral band measures 15/^ broad and 
shows two distinct and one rather indistinct row of nuclei directly 
under the cuticle; sections, however, show other nuclei farther away 
from the cuticle; in one section very near the mouth, the band meas- 
ured 13.2yu dorso-ventrally; the band increases gradually in breadth; 
at the posterior end of the esophagus in one worm it measures -iSyu; in 
one specimen, it is 56/< and in another specimen 88yu at this point: at 
the equator of the worm it measures 90yu; it retains this breadth more 
