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Professor R. M. SHACKLETON said that the uncertainty about the Manx Slate Dictyonema remained. There was no doubt that the specimens in the Manchester Museum were of a dendroid and probably a Tremadocian Dictyonema, as the President [Professor Bulman] had confirmed some years ago when the specimens were submitted to him by Dr J. E. Gillott, but there was doubt, first expressed by Lamplugh, as to whether the specimens really came from the Manx Slates as H. Bolton claimed. Lamplugh’s apparent reasons for suspicion were, first, that neither he, Bolton, nor anyone else could find another Dictyonema at Cronkshame and, secondly, that this locality was near a ‘crush-breccia’, close to which fossils could not have survived. The second argument was invalidated by Gillott when he showed that the breccias were slide-breccias. Gillott had the matrix of the fossil sliced, compared it with slices of the Cronkshame rock and with one
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