Keller J 1894 (citation)- Sekera E 1903 (citation)- mentions reproductive organs. Luther A 1907 (citation)- discusses characters of. Graff L v 1909 (citation)- description and illustration from Zurich. Bresslau E 1912 (citation)- illustration of to show asexual reproduction, p 976. Wilhelmi J 1913 (citation)- outline with muscle? illustration, p 23. Graff L v 1913 (citation)- p 26-27, description and illustration as by Keller 1894- in Stenostomum. Steinmann P, Bresslau E 1913 (citation)- asexual reproduction in p 310, illustration. Marcus E 1945 (citation)- is closely like agile he says, p 30, also p 45, 67. Marcus E 1945 (citation)- on details of pharynx of.
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