Note 133 — Chapter VI · WHAT IS TAUGHT BY EMBRYOLOGY?
Reading edition
Bidder und Kupffer, Textur des Rückenmarks, 1857, p. 108. [What is said in the text has been rendered doubtful by the recent researches of Mr. F. Balfour, On the Development of the Spinal Nerves in Elasmobranch Fishes (Philos. Trans., Vol. CLXVI. Part I.), which show that in these fishes the ganglion has its origin in the spinal cord.]