EMBRYOLOGY OF BARNACLES. 275 
was at first thought to be an adult Crustacean, and described 
under the name of Nauplius. The Nauplius 
of the genuine barnacles (Fig. 227) has three 
pairs of legs ending in long bristles, with a 
single eye, and a pair of antennz, the body 
ending in front in two horns, and posteriorly 
in a long caudal spine. After swimming 
about for a while, the Nauplius attaches it- 
self to some object by its antenne, and now a — gig 994 sIa, 
strange transformation results. The body is Rae career 
enclosed by two sets of valves, appearing as if After Darwin. 
bivalved, like a Cypris (Fig. 228); the peduncle grows out, 
une fh 
haunt 
it) 
mat ii 
Fig. 226. —Comple- 
mentary male of Scal- 
pellum regium, greatly 
enlarged. — After Wy- 
ville-Thompson, 
Fig, 225.—Scalpellum regi a, complementary 
male, lodged within the valves.— After Wyville- 
‘Thompson. 
