74 HOUSE, GARDEN, AND FIELD 



All through the winter and spring the nauplius of the 

 rock-barnacle abounds in the surface-waters of the sea, 

 and some kinds may be found at any time of the year. 

 If a boat and tow-net cannot be had, nauplii may be pro- 

 cured by placing in a bowl of water a stone well-covered 

 with living barnacles. After a few hours nauplii will be 

 emitted, though in no great numbers. This method 



FIG. 18. Cypris of rock-barnacle in side-view. To the left 

 (head-end) are seen the adhesive feelers ; to the right the six 

 fringed legs and the forked tail. The bivalve shell, the large, 

 dark, paired eye, &c., are also shown. 



succeeds best in spring. The second larval stage, which 

 was seen by Thompson changing to a rock-barnacle, is 

 most plentiful in May. This is called the Cypris-stage, 

 from its resemblance to Cypris, a well-known small crusta- 

 cean with bivalve shell. 



Barnacle-larvae do not depend for transport entirely 

 upon their own swimming power. The currents which are 

 set up by wind and tide carry them along far more 

 rapidly than their feeble exertions could possibly do. It 



