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DISCOVERY REPORTS 



separated by wide chitinous interspaces, distinctly delimited. The peduncle has scales 

 very different from those of the younger stages. The formation of scales in the peduncle 

 is now ended. It is interesting to note that the scales are rather small and rounded, with 

 a little point standing out from the cuticle. 



Fig. 2. Scalpellum gibberiim. a, b, c. Young specimens (total lengths 2-30, 4-30, and 11 mm. respec- 

 tively), d. Full-grown specimen, lateral view (total length 30 mm.), e. The same specimen, rostral view. 



This comparison shows the importance of studying young and old stages of Cirripedes, 

 especially those species with many plates, as in Scalpellum. Broch (1927) discussed the 

 changes in the shape of the capitular plates during the ontogenetic development, a 

 subject also mentioned by Nilsson-Cantell (1921). Accessory parts are added to the 

 primary parts. A comparison is made by Broch between different species of Scalpellum. 



