THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA) 95 



distally and one near the middle of each segment, and are all about 

 twice as long as the relatively long segments. On the outer curvature 

 a single set arises distally on every two to four segments, and is 

 about twice as long as the segments. 



Figure 24. — Cryptophialus coronatus Tomlinson, 1960a: a, female, side view, with male 

 larva, ventral view, from Balanus tirdinnahulum from Dakar, Senegal; b, mandible from 

 specimen from Thais nodosa from West Africa; c, burrow aperture with contained 

 operculum of female. 



The mouthparts of C. coronatus are typical of the genus. A long 

 labrum extends to the mantle aperture and terminates with many 

 fine bristles. The mandibles have three major teeth plus many addi- 

 tional heavy bristles projecting along the chewing edge. Additional 

 lighter bristles are located on the broad face of the mandible. 



