Nathan Cobb describes nematode lonema, as "Setae on head 4; eyes with lenses; amphid transverse-oval, at lips; among algae."
What nematode anatomical structure has "eyes with lenses"?
Or what is Cobb referencing?
Proceedings of the Helminthological Society of Washington
VOLUME 2, WASHINGTON, D. C., JANUARY 1935, NUMBER 1