CIRRIPEDIA. 



417 





The anterior part of the body becomes elongated in the 

 Lepadidae into the stalk or peduncle and the ovaries and cement 

 gland are contained in it. The antennae become shorter and 



^^^^~'^ 

 cd 



rf 



FIG. 270. Pupa of Lepas pectinata in optical section. (From Lang, after Claus.) ca 

 carina ; cd cement gland ; d intestine ; L liver ; o mouth ; pa paired eye ; rf [tho- 

 racic appendages ; sc scutum ; siw adductor muscle ; t tergum ; mi nauplius eye ; 1 an- 

 terior antennae. 



stouter, and soon the region around them becomes flattened 

 into a disc applied to the supporting object, though the com- 



tf 



FIG. 271. Diagrams illustrating the metamorphosis of Lepas. A, Cypris stage ; B, attached 

 pupa ; C, young Lepas still surrounded by the loosened Cypris shell (). a' first antenna ; 

 ab abdomen ; c carina ; d intestine ; m mouth ; o nauplius eye ; pa paired eye ; rf thoracic 

 imbs ; s Cypris shell : sc scutum ; t tergum ; x ' dorsal fold ' ; y ventral fold previously 

 loccupied by the apodemes of the antennary muscles (from Korschelt and Heider). 



paratively minute antennae can be distinguished even in the 

 full-grown barnacle, 

 z rn 



