24 lepadiDjE. 



vesiculse seminales : the penis is represented by a minute, 

 apparently imperforate projection. I have already briefly 

 described the pair of large, gut-formed bodies in the 

 larva, into the anterior ends of which the cement-ducts 

 ran, and evidently derived their slightly opaque, cellular 

 contents. At a very early age, before the young Cirripede 

 can be distinctly made out, the posterior ends of these 

 gut-formed bodies are absorbed, so as not to pass beyond 

 the caeca of the stomach. When the young Cirripede is 

 plainly developed within the larva, these bodies in a rela- 

 tively reduced condition are still distinct near the cseca, 

 and at the opposite or anterior end (i. e. lower, in the 

 position in which Cirripedes are usually figured), they have 

 branched out into a sheet of delicate inosculating tubes ; 

 these could be traced by every stage, until, in the young 

 perfected Cirripede, they filled the peduncle as ordinary 

 ovarian tubes. In the larva, the two gut-formed bodies 

 or incipient ovaria keep of equal thickness from one to 

 the other end, but in the mature Cirripede, the ovarian 

 tubes in the peduncle and the small, glandular, grape- 

 like masses, near the stomach-cseca, are connected only 

 by a delicate tube ; this I failed in tracing in specimens 

 in the very immature condition of those now under 

 description. 



The larva fixes itself with its sternal surface parallel 

 and close to the surface of attachment, and the antennas 

 become cemented to it : if the Cirripede, after its 

 metamorphosis had remained in this position, the cirri 

 could not have been exserted, or only against the sur- 

 face of attachment ; but there is a special provision, that 

 the young Cirripede shall immediately assume its proper 

 position at right angles to the position which it held 

 whilst within the larva, namely with its posterior end 

 upwards. This is effected in a singular manner by the 

 exuviation of the great compound eyes, which we have 

 seen are fastened to the outer arms of the double # UU # - 

 like, sternal apodemes : these together with the eyes 

 stretch transversely across, and internally far up into, 



