Diagram of the head and adjacent region of <i>Peripatus</i>. Monoprost homerous.
Edwin Ray Lankester after Goodrich, <i>Q. J. Micr. Sci.</i> vol. xi, (p. 247?)
published 1911
<i>Encyclopædia Britannica</i> (11th ed.), v. 2, 1911, p. 675