VIII. ] 



HOMOLOGIES. 



175 



surface of the body we find a quantity of movable append- 

 ages. Such are, e. g., feelers (Fig. 9), jaws (Figs. 6, 7 

 and 8), foot-jaws (Fig. 5), claws and legs (Figs. 3 and 4) 

 beneath the cephalo-thorax ; and flat processes (Fig. 2), 

 called " swimmerets," beneath the so-called tail or abdo* 

 men. 



PAST OF THE SKELETON OF THE LOBSTEK. 



Now, these various appendages are distinct and differ- 

 ent enough as we see them in the adult, but they all appear 

 in the embryo as buds of similar form and size, and the 

 thoracic limbs at first consist each of two members, as the 

 swimmerets always do. 



