180 



Heredity. 



which are pretty closely reliUed to the coi)eiiocls, which 

 thev resemble somewliat, durino: the earlv st.iores of their 

 development. The young swim freely in tiie water fur 

 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 antennae of the free larva become 

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



\> 



Fio. 15. Female specimen of An- 

 chorella uncinata. 



Fig. 16. An hermaphrodite stalked 

 barnacle. Pollicipes cornncopia. 

 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. 



