. Fresh-water biology. Freshwater biology. THE WHEEL ANIMALCULES (ROTATORIA) 575 the typical free-swimming rotifers. Yet again, as in most other cases, free-swimming species form a transition to these extreme types. One finds the same pecuKar corona, the same remarkable type of jaws, and various other features in common with the MeUcertidae, in a number of free-swimming rotifers. These in- clude the genera Pterodina (Fig. 942), Pompholyx, Pedalion (Fig. 946),. Fig. 865. Corona oi Lacinularia socialis Ehr., to show the two wreaths of cilia. A, Dorsal view. B, Side view. (After Wesenberg-Luod.)
. Fresh-water biology. Freshwater biology. THE WHEEL ANIMALCULES (ROTATORIA) 575 the typical free-swimming rotifers. Yet again, as in most other cases, free-swimming species form a transition to these extreme types. One finds the same pecuKar corona, the same remarkable type of jaws, and various other features in common with the MeUcertidae, in a number of free-swimming rotifers. These in- clude the genera Pterodina (Fig. 942), Pompholyx, Pedalion (Fig. 946),. Fig. 865. Corona oi Lacinularia socialis Ehr., to show the two wreaths of cilia. A, Dorsal view. B, Side view. (After Wesenberg-Luod.) Triarthra (Fig. 944), and Tetramastix (Fig. 945). These rotifers are the only ones that have corona and jaws hke those of the Meli- certidae, and they agree with them in many other particulars. Thus, all have two eyes, while most other rotifers have but one. In all there is either no foot, or it is a pecuKar one, lacking the characteristic toes. In Pterodina the foot ends in a bundle of ciUa, and this is likewise true of the young of the Melicertidae. In. 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 Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
