. Fresh-water biology. Freshwater biology. GASTROTRICHA 627 15(14) Dorsal spines simple; «.e., without lateral barbs or points. ... 16 16 (17) Anterior region sharply set off from narrow "neck" region. Chaetonotus formosus Stokes 1887. Length 0.169 mm- Oral ring minutely beaded. Head three lobed. Dorsal and lateral aspects of body covered with short, fine recurved spines with slight basal enlargements (but without scales?). Spines all subequal, in length 0.0292 mm., or less. Trenton, New Jersey. No figure published. 17 (16) Transition from anterior region to body gradual, not sharply

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. Fresh-water biology. Freshwater biology. GASTROTRICHA 627 15(14) Dorsal spines simple; «.e., without lateral barbs or points. ... 16 16 (17) Anterior region sharply set off from narrow "neck" region. Chaetonotus formosus Stokes 1887. Length 0.169 mm- Oral ring minutely beaded. Head three lobed. Dorsal and lateral aspects of body covered with short, fine recurved spines with slight basal enlargements (but without scales?). Spines all subequal, in length 0.0292 mm., or less. Trenton, New Jersey. No figure published. 17 (16) Transition from anterior region to body gradual, not sharply marked at any point 18 18 (19) Head rounded Chaetonotus brevispinosus Zelinka iS. Length of body 0.095 to 0.149 mm., of esophagus 0.0223 mm. Spines somewhat curved, remarkably short, slightly larger poste- riorly, arranged in eleven rows Head circular in front, with four eye-spots. The only American species reported more than once. Orono, Me., and Trenton, New Jersey. It is the C. larus of Stokes, also of Fernald. Fig. 971. Chaetonotus brevispinosus in dorsal view, X 460, with spinose scale more highly magnified. (After Zelinka.) 19 (18) Head five lobed Chaetonotus acanthodes Stokes 1887.. 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 work.. Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. , etc. ]