Westblad E 1946 (citation)- brief description, illustration, p 50, material from Karling. p 26 notes on ectodermal nervous system at base of epithelium. Westblad E 1948 (citation)- p 3 mentions this as occuring in shallow water as well as in deeper parts. p 22 superficial nerve plexis in; p 48 on female reproductive organs; p 38 notes primitive character of penis as well as of nerves; p 39 illustration of penis; p 51 nervous system is epithelial therefore more primitive than other Convoluta. Marcus E 1948 (citation)-lists this in discussion as species with 2 gonapores, p 117. Marcus E 1949 (citation)- mentions this p 11. Marcus E 1954 (citation)- mentions p 426. Ax P 1959 (citation)- compares his C. subsalina with this p 57. Luther A 1960 (citation)- good illustration, brief description, etc. Ax P 1961 (citation)- notes outer nerve net. Ax P 1963 (citation)- notes epithelial nervous system in. Dorjes J 1968 (citation)-moves here from Convoluta, p 103. Straarup BJ 1970 (citation)- on ecology and food of. Karling TG 1974 (citation)- list p 9 in key p 12, illustration p 13, ecology of p 28, 67, description p 50. Dorjes J, Karling TG 1975 (citation)- Swedish Museum of Natural History, note on distribution between this and P. cellata. Hendelberg J 1977 (citation)- Electron microscopy on sperm- 9 + 2 axonemes. Ehlers U, Doerjes J 1979 (citation)- comparison p 38, 40.
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