THE SESSILE BARNACLES. 



95 



Maxilla with six spines between upper and lower pairs. Cirrus iii 

 with a few twin spimiles, intermediate between figures 10a and 20&. 

 Cirrus vi has five pairs of spines. 



FlG. 20. B. AMPHITRITE NTVEUS, MARCO, FLA. O, 9TH SEGMENT POSTERIOR RAMUS OF CIRRUS m. 6, GTH 

 SEGMENT ANTERIOR RAMUS CIRRUS in. C, 1ST CIRRUS, d, LABRUM. e, PALPUS. 



Cedar Keys, Florida. Maxilla with five spines between upper and 

 lower pairs, the latter standing on a little projection. Otherwise like 

 Marco niveus. 



Relioboih, Delaware. Cuticle thin but persistent on parietes and 

 radii. Gray lines distinct. In some examples the carina has a 



FlG. 21. B. AMPHITRITkJ NIVEUS, REHOBOTH, DEL. a, LABRUM AND PALPUS. 6, MANDIBLE. C, TWO 

 SEGMENTS FROM THE POSTERIOR RAMUS OF CIRRUS m. 



violet tint. Scutum with the ridge below the articular ridge weak, 

 adductor ridge strong and longer than in Marco individuals. Labrum 

 with two-notch-three teeth. Cirrus i, 17 at.d 11 segments. Cirrus 

 ii, 12 and 10 segments, the posterior ramus three-fourths as long as the 



