180 



Heredity. 



which are pretty closely related to the copepods, which 

 they resemble somewhat, during the early stages of their 

 development. The young swim freely in the water for 

 a time, but finally attach themselves to foreign bodies, 

 head downwards, by their antennae, and are sedentary 

 for the rest of their life. In the stalked or peduncu- 

 lated barnacles, the antennas of the free larva become 

 replaced in the adult by a long peduncle, at the top of 



FIG. 15. Female specimen of An- 

 chorella iincinata. 



FIG. 16. An hermaphrodite stalked 

 barnacle. Pollicipes cornucopia, 

 c, carina. t. tergum. s. scutum. 

 r. rostrum, p. peduncle. 



which there is an irregularly triangular box, the capi- 

 tulum, made up of a number of calcareous plates. Inside 

 this box the animal is placed, head downwards, and 

 although it is greatly modified to fit it for this protected 

 sedentary life, it still presents unmistakable evidences 

 of its crustacean affinity, such as the mouth-parts, the 

 segmented body and limbs. 



