. Seaside studies in natural history. Marine animals. BOLINA. 31 Kg. Bolina. (BoUna alaia Ag.) The Bolina (Pig 32), lik^ the Plenrobrachia, is slightly oval in form, with a longitudinal split at one'end of the body, forming a mouth which opens into a capacious sac or digestive cavity. But it differs from the Plenrobrachia in having the oral end of the body split into two larger lobes (Pig. 31), hanging down from the mouth. These lobes may gape widely, or they may close completely over the mouth so as to hide it from view, and their different aspects under various degrees of expansion or c
. Seaside studies in natural history. Marine animals. BOLINA. 31 Kg. Bolina. (BoUna alaia Ag.) The Bolina (Pig 32), lik^ the Plenrobrachia, is slightly oval in form, with a longitudinal split at one'end of the body, forming a mouth which opens into a capacious sac or digestive cavity. But it differs from the Plenrobrachia in having the oral end of the body split into two larger lobes (Pig. 31), hanging down from the mouth. These lobes may gape widely, or they may close completely over the mouth so as to hide it from view, and their different aspects under various degrees of expansion or contrac- tion account for the discrepancies in the description of these animals. We have seen that the Pleurobrachia moves with the mouth upward; but the Bo- lina, on the contrary, usually carries the mouth downward, though it occasionally reverses its position, and in this attitude, with the lobes spread open, it is exceedingly graceful in form, and looks like a white flower with the crown fully expanded. These broad lobes are balanced on the other sides of the body by four smaller appendages, divided in pairs, two on each side (Pig. 32), called auricles. These so-called auricles are in fact organs of the same kind as the larger lobes, though less developed. The rows of locomotive flappers on the Bo- lina differ in length from each other (Pig. 31), instead of being equal, as in the Plen- robrachia. The four longest ones are op- posite each other on those sides of the body where the larger lobes are developed, the four short ones being in pairs on the sides where the auricles are placed. At first sight they all seem to terminate at the margin of the body, but a closer fig. 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 Agassiz, Elizabeth Cabot Cary, 1822-1907; Agassiz, Alexander, 1835-1910, joint author
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmarineanimals, bookye
