300 



ANIMAL LIFE 



indirect. The larva of the lamprey eel presents features 

 of such contrast to its parent that for many years it was 



FIG. 336. Metamorphosis of a shrimp, a, nauplius ; b, first zosea stage ; c, sec- 

 ond zosea stage ; d t mysis stage ; e, adult. From Weismann after MUller. 



considered an animal of different species and named Ammo- 

 coetes. It has an over-arching upper lip instead of a 

 round sucking mouth, rudimentary eyes, and gill pouches 

 opening into the pharynx instead of into a respiratory 



