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dichotomous ramification of the roots seen in the fossil 
types, have been concentrated in these degraded living 
representatives in the one root organ. Anyhow the facts 
afford a strong confirmation of the Lycopodiaceous character 
of the fossil Sigillaria to which these Stigmarian roots in 
part belonged. 
Referring to Haloma, which Binney thought was a root 
of Lepidodendron, Professor Williamson exhibited a cast 
of a fine specimen of Lepidodendron elegans from the Leeds 
Museum, in which each Lepidodendroid branch terminated 
dichotomously in a series of subdivisions, each one of which 
possessed all the characteristics of a true Haloma. 
Dr. Hartog, referring to the memoir recently published 
by Profesor Williamson and himself in the Annates des 
Sciences Naturelles, in which they criticised the opinions of 
M. Renault on the relations of Lepidodendron, Stigmaria, 
and Sigillaria, spoke of the part he had taken in the matter. 
He also made some remarks on Professor Williamson’s inter- 
pretation of his discoveries in connection with Stigmaria. 
