. Bulletin - United States National Museum. Science. 206 BULLETIN 93^ UNITED STATES NATIONAL MUSEUM. the bnses of the ribs minutely and very weakly denticulate. Basis solid, denticulate at the edge, radially striate in the young (pi. 53, fig. 2). The scutum is noticeably warped in large specimens. It has strong, somewhat unevenly spaced growth ridges and close, rather weak or deep longitudinal striae. Inside there is a moderately prominent, thin, articular ridge and a narrow articular groove. The adductor. Fig. G5.—Balanus hameei. a, maxilla. 6, mandible, c, labbum. ridge is wholly confluent w
. Bulletin - United States National Museum. Science. 206 BULLETIN 93^ UNITED STATES NATIONAL MUSEUM. the bnses of the ribs minutely and very weakly denticulate. Basis solid, denticulate at the edge, radially striate in the young (pi. 53, fig. 2). The scutum is noticeably warped in large specimens. It has strong, somewhat unevenly spaced growth ridges and close, rather weak or deep longitudinal striae. Inside there is a moderately prominent, thin, articular ridge and a narrow articular groove. The adductor. Fig. G5.—Balanus hameei. a, maxilla. 6, mandible, c, labbum. ridge is wholly confluent with the articular rib above, running straight to the basal margin, where it defines a rather large de- pressor muscle pit. It is often iceah or almost obsolete in American specimens. The tergum has less coarse growth-ridges than the scutum, and there are a few longitudinal striae near the carinal border. A furrow leads to the spur, its sides more or less folded in in old specimens. The spur is rounded at the end, moderately long, typically separated by its own width from the basiscutal angle, but more distant in most American specimens, in which it is sometimes separated from the basiscutal angle by nearly double its own width. Articidar ridge short, sharp, and moderately high. Crests for the depressor muscle sharp and numerous. The labrum has a very shallow notch and two teeth on each side (fig. r>5r^). The mandible has four primary acute teeth, with smaller ones be- tween the third and fourth and below the fourth (fig. 655). The maxilla has a notch below the upper large spines, and many crowded spines on the edge below it. The upper edge is bearded for a long distance (fig. 65«). Cirrus i has subequal rami of 16 and 14 segments. Cirrus ii with 17 and 19 segments, the rami subequal. Cirrus iii with 15 and 14 segments, the anterior ramus slightly longer. The external anterior faces of the segments have many long. Please note that these images are extracted from scanned pa
Size: 2298px × 1087px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
