NOTES ON A SPECIES OF BARNACLE. 
409 
nauplius was in the act of molting. The dorso-caudal spine and the thoraco-abdominai 
process could be seen to evaginate as they were drawn out from the old cuticle. In 
a short time the appendages and body were out except for the long spines; more 
pronounced movements soon freeing these, the molt was completed. The nauplius in 
this stage, represented by fig. 11, measures, from the anterior profile of the body to 
jtX 
S.a. 
the end of the dorso-caudal spine, 82 mm , or about four times its length in the preceding- 
stage. Occasionally a nauplius is found with the evagination of the dorso-caudal spine 
incomplete, so that the latter appears to become abruptly smaller at some point. 
In tig. 11 the position of the “frontal horns” should be noted, as well as the 
presence of the sensory appendages (s. a.) projecting from underneath the head 
between the frontal horns. Most of the spines are branched; the dorso-caudal spine 
