Note 53 — 1. Family BALANIDÆ, (or Sessile Cirripedes). (continued 2)
Reading edition
According to M. Joly, (‘Annales des Sciences Naturelles,’ 2d series, tom. xix, p. 59) in the larva of the macrourous Caridina, the natatory legs appear before the gnathites or parts of the mouth; so that in ordinary Crustaceans there is no invariable order of development from the anterior towards the posterior end of the body, as has sometimes been supposed.