1863 W. Thomson in 12 409 It is impossible to avoid at once recognizing in the vascular pseudembryonic appendage of Asteracanthion violaceus, the three water-feet of Brachiolaria.
1877 VII. 631/2 The development of the ambulacral system commences with the formation of a sac which lies to the left of the junction of the pseud-embryonic gullet and stomach.