. Bulletin - United States National Museum. Science. Fio. 52.:—Balanus crexatus. a, !>, scutum and tergum of a Greexlaxd specimen, Cat. No. 24911. C, TERGUM OF A SPECIMEX FROM THE GRAND BANK, ALBATROSS STATION 2462, WALL SIMILAR TO PLATE 40, FIGURE 6. at the posterior distal angles are about as long as the segments. Penis is longer than the jDosterior cirri. The maxilla (fig. 49&) has no notch under the superior pair of large spines; below them there are nine subequal spines, with two brushes of bristles at and below the rounded lower ajtigle. The labrum (fig. 49a) has two exceedingly s
. Bulletin - United States National Museum. Science. Fio. 52.:—Balanus crexatus. a, !>, scutum and tergum of a Greexlaxd specimen, Cat. No. 24911. C, TERGUM OF A SPECIMEX FROM THE GRAND BANK, ALBATROSS STATION 2462, WALL SIMILAR TO PLATE 40, FIGURE 6. at the posterior distal angles are about as long as the segments. Penis is longer than the jDosterior cirri. The maxilla (fig. 49&) has no notch under the superior pair of large spines; below them there are nine subequal spines, with two brushes of bristles at and below the rounded lower ajtigle. The labrum (fig. 49a) has two exceedingly small teeth on each side. The form from the Grand Banks of Xewfoundland (pi. 40, fig. 1) is characteristic. The walls taper but little upward, leaving a large orifice, which is deeply toothed in the young, but in old specimens the points are often broken or worn off. The parietes have massive, irregular, rounded ribs. There are generally'' three or four ribs on rostrum and lateral compartments, one on the carinolateral, two to four on the carina, in the half-grown stage (pi. 40, fig. 6, Cat. No. 9215); but in old ones the number is increased by division of the ribs. The tergum is broader than in English crenatus^ with its carinal margin longer. It is broader than the scutum. Often the spur is shorter than in Greenland crenattos. There are also columnar (pi. 40, fig. 2) and tubular forms, flaring toward the orifice (pi. 40, figs. 5-55), quite like those from Greenland. Two specimens of the col- umnar form out of the lot from Alhatross station 2462, Grand Banks,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
