The observations here briefly presented should help solve a question in the literature, regarding the cocoon of Procotyla fluviatilis. The results also indicate that the breeding season of this species may be longer than heretofore reported. A few additional observations on the young worms, and on food habits of the adult are also included.
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Anderson, John Maxwell
"Notes on the Turbellarian, Procotyla fluviatilis Leidy,"
Field and Laboratory: Vol. 19
Available at: https://scholar.smu.edu/fieldandlab/vol19/iss2/6