. Fresh-water biology. Freshwater biology. 11 (2) Body provided with spines either attached to the dermal scales or springing directly from the surface. Family Chaetonotidae . 12 12 (30) Caudal process simple; spines attached to dermal scales. Chaetonotus Ehrenberg 1830 . 13 A large and complicated group; more than forty species already described; ten species re- ported from North America by Stokes. 13 (20) Dorsal spines nearly uniform in length, at most twice as long on posterior region as on anterior region, and without any marked transition from one size to another 14 14 (15) Dorsal spines
. Fresh-water biology. Freshwater biology. 11 (2) Body provided with spines either attached to the dermal scales or springing directly from the surface. Family Chaetonotidae . 12 12 (30) Caudal process simple; spines attached to dermal scales. Chaetonotus Ehrenberg 1830 . 13 A large and complicated group; more than forty species already described; ten species re- ported from North America by Stokes. 13 (20) Dorsal spines nearly uniform in length, at most twice as long on posterior region as on anterior region, and without any marked transition from one size to another 14 14 (15) Dorsal spines with accessory barbs or points. Anterior region sharply set off from so-called "; Chaetonotus similis Zelinka 1889. Length of body to mm., of esophagus mm. Body covered dorsally and laterally with triangular scales carrying spines with accessory point. Oral funnel plicate. Originally described from Trenton, New Jersey, as Ch. maximus which it closely resembles in head and body. Under a high magnification differ- ences in the spines appear. All of them are forked and have a fine lateral point near the tm. 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
