Abbass, H. L., 1967. Geological Survey Geological Museum, Palaeontological Series, Monograph. 4, 6-154 .
New Species-Group Names:
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cairoensis Abbass, 1967. p. 119. pl. 16. f. 6. 7.
Abbass, H. L., 1967. Geological Survey Geological Museum, Palaeontological Series, Monograph. 4, 6-154 .