Bull. U. S. B. F., 1923-24, (Doc. 963.) 
Fia. 26— Long'tudinal section of rectum of L. luteola 3 mm. long. A, E, F, and G, Stephana- 
dheus sn.; B, filamentous diatom, may be Odontidium; C, probably a pollen grain; D, cell of a 
green alga. X430. 
