THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA ) 83 



The head and mouthparts are not exceptional. Segmentation of 

 the mouth cirri tends to be so obscure or vestigial that no attempt 

 will be made to describe it. 



Figure 19. — Berndtia nodosa Tomlinson, 1967, from Psammocora contigua from Singapore: 

 a, female side view; b, surface view of one side of operculum of a, rostral (attachment) end 

 at right; c, mandible; d, first maxilla. 



There are five pairs of biramous, multisegmented terminal cirri. 

 The lesser curvature of each segment supports a distal pair of long 

 setae (two and a half times segment length) and a central, shorter 

 pair (one times segment length). In addition, a short unpaired bristle 

 extends from between the bases of the distal pair. The distal end of 

 every second to sixth segment along the greater curvature supports 

 a single setae (one and a half times segment length). None of these 

 bristles are plumose. The protopods are two-segmented, with the 

 proximal segment not quite three times as long as the distal segment. 



