14 
clearer portion, situated closer to the mouth, and of more lip-like 
appearance (fig. 4), and a smaller, darker, external ridge, which 
appears of more distinctly papillary nature; from base to tip these 
larger lip-like papillae measure about 23 yw. There is some yariation 
in the specimens, due possibly to their condition, which makes it dif- 
ficult to infer just how these papillae would appear in perfectly fresh 
or in well-preseryed material. Extending caudad from the more 
strictly papillary portion (the external ridge), in seyeral cases struc- 
tures were seen which were strongly indicatiye of neryes. 
Cervical 2 Xtj)illse haye not been obseryed. 
The excretory 2)076 is small, medio-yentral, not prominent. 0.432 to 
0.52 mm. from the anterior end. 
■iOO ^ 
Fig. 4. 
/ 00 yUU 
Fig. 5. 
Fig. 4. — Greatly enlarged profile view of one of the submedian lip-like papillae, showing the lip-like 
projection near the mouth and the external papillary portion. 
Fig. 5. — Enlarged transverse section of head, close to the mouth. Xote the following points: The 
cuticle seems to present two layers; it shows thickenings near the lateral lines; immediately 
under the cuticle, the thin subcuticula is visible as a light line extending around the body; at 
the four longitudinal lines (dorsal, ventral, and two laterals) the longitudinal bands are seen, 
extending toward the esophagus, and connected by a circular bridge which surrounds the 
esophagus; the lateral bands are thicker than the median bands, and present a dorsal and a 
ventral half; each half shows a row of nuclei; besides these a single middle nucleus is seen; the 
muscles are divided into four quadrants by the longitudinal bands; centripetally of the more 
darldy colored contractile muscular layer the protoplasmic processes extend toward the esoph- 
agus, forming a mesh work; the esophagus is central and shows a triradiate lumen and radial 
symmetry. 
Tail. — The profile of the tail (figs. T-9) is not uniform, but it bends 
slightly yentrad. In one mounted tail the transyerse diameter at the 
anus is 128/t; in one mounted tail the dorso-yentral diameter at the 
anus is 80yw; and in one unmounted specimen, the dorso-yentral diame- 
ter at the anus is 120/^. In these three specimens, the anus is 96, 64, 
