Bulletin - United States National Museum . hin the ventral outline andoverlies the base of the tergum. The tergum is V-shaped, having a curved occludent branch abouttwice as wide as the long, slender, and curved carinal branch. Thisis nearly twice the length of the occludent branch. The apex is acuteand somewhat recurved. The carina is strongly arched, more so above. The umbo turnsinward, but is not quite terminal, a flattened continuation of the sidesextending beyond it. The roof is very deeply channeled, with high, THE BAENACLES IN THE U. S. NATIONAL, MUSEUM. 71 narrow bordering ribs. The si
Bulletin - United States National Museum . hin the ventral outline andoverlies the base of the tergum. The tergum is V-shaped, having a curved occludent branch abouttwice as wide as the long, slender, and curved carinal branch. Thisis nearly twice the length of the occludent branch. The apex is acuteand somewhat recurved. The carina is strongly arched, more so above. The umbo turnsinward, but is not quite terminal, a flattened continuation of the sidesextending beyond it. The roof is very deeply channeled, with high, THE BAENACLES IN THE U. S. NATIONAL, MUSEUM. 71 narrow bordering ribs. The sides are rather narrow and of nearlyequal width throughout. The upper lateral plate is irregularly hexagonal, with the calcifiedportion broadly V-shaped, the two branches nearly equal, somewhatcurved. A narrow appendage or third branch arises at the apex andruns toward the tergum in a direction at a right angle to the tergalbranch. There is no rostrum. The rostral lateral plate is V-shaped, the basal branch of the V beingshorter and
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
