Note 166 — Chapter XV
Reading edition
Scott states that in the larva of Petromyzon the pituitary body is derived from the walls of the nasal pit; Quart. J. of Micr. Science, Vol. XXI. p. 750. I have not myself completely followed its development in Petromyzon, but I have observed a slight diverticulum of the stomodæum which I believe gives origin to it. Fuller details are in any case required before we can admit so great a divergence from the normal development as is indicated by Scott’s statements.