THE CRUSTACEA 113 



Its antennae or horns become provided with suckers, 

 and with a gland that supplies a kind of glue. 



It leaves off feeding for a while, and by means of its 

 suckers attaches itself to some object, preferably a bit of 

 floating wood. (It has a reserve store of nourishment, in 

 the form of oil globules.) 



The little shells now fall off, and are lost, while the portion 

 of its head just behind the antennae develops enormously, 

 and the front part of the antennae has the holding power 

 of its suckers augmented by a supply of the " glue." 



The front part of the head still grows, until by-and-by 

 this becomes the huge, semi-membraneous, semi-aqueous, 

 " stalk " which, in bulk, is more (as a rule) than the rest of 

 its anatomy. 



Some have stalks a foot or more in length and half or 

 five-eighths of an inch in diameter, others have but short 

 ones. The specimens photographed are entire, and are 

 " short stalked." 



The legs become modified into many- jointed, feather- 

 shaped (Cirripedial) appendages, the office of which now 

 is, as Professor Huxley said, " to kick the food into the 

 mouth." 



A set of shells, five in number, and beautifully hinged 

 together, protect the internal anatomy, and the ship- 

 barnacle is complete. l>! 

 (An error very common among fishermen and other sea- 

 farers is that the barnacle " bores holes in timber." It 

 does not do so, only attaches itself ; but logs, etc., on 

 which it is found affixed, are as a rule seen to be bored, 

 but this is by the mollusc Teredo, usually called the 

 " Ship-worm.") 



Sketches of the Nauplius and Cypris stages of Lepas are 

 shown in Fig. 45. 



Allied to Lepas is a very similar form, in which the shells 

 are replaced by membraneous flaps. This is Conchoderma. 



