Clarification of the supra-condyloid foramen in humans and animals.
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Clarification of the supra-condyloid foramen in humans and animals.
Discusses his blunder in "confounding the two foramina" [in the skull] of apes [in Descent].
Discusses views of George Rolleston, St George Mivart, and Huxley on the occurrence of the foramina.
The presence of the inter-condyloid perforation in man no more indicates his simian relations than it does his relations to numerous other animals.
Is preparing a new edition of Origin [6th ed. (1872)] and asks GB for information on the gradations between the vibracula and avicularia of the Polyzoa and on what he bases his opinion concerning the homology of the avicularium with the zooid.
Replies to CD’s queries about the homologies of the avicularian and vibracular organs of Polyzoa and gives examples of gradations between the two.
CD plans to use notes provided by GB. [See Origin, 6th ed., p. 193.]
Returns CD’s MS [for Origin 6th ed.] on the defensive organs of the Polyzoa, with his comments.
Thanks for information on platycnemic tibiae found in America. Believes the condition is of two kinds as exemplified by Gibraltar and Cro-Magnon tibiae on one side and the Welsh form on the other. Would like to know which of the two forms the American bones are; their proportions suggest they are very like the Welsh tibiae.