. Fresh-water biology. Freshwater biology. AQUATIC EARTHWORMS 639 10(11) Setae of dorsal bundles all uncinate. Pamwais Czerniavsky 1880. P. litoralis (Miiller) reported as abundant on the New England coast and may occur in adja- cent fresh waters. The first dorsal setae are on V. II (10) Dorsal setae nearly straight, slightly toothed or simple-pointed. Ophidonais Gervais 1838. 0. serpentina (Miiller) may be easily recognized by the small irregularly distributed dorsal setae; by the four large transverse pigmented areas on the anterior region, and by the relatively large size. Length 25-30 mm.
. Fresh-water biology. Freshwater biology. AQUATIC EARTHWORMS 639 10(11) Setae of dorsal bundles all uncinate. Pamwais Czerniavsky 1880. P. litoralis (Miiller) reported as abundant on the New England coast and may occur in adja- cent fresh waters. The first dorsal setae are on V. II (10) Dorsal setae nearly straight, slightly toothed or simple-pointed. Ophidonais Gervais 1838. 0. serpentina (Miiller) may be easily recognized by the small irregularly distributed dorsal setae; by the four large transverse pigmented areas on the anterior region, and by the relatively large size. Length 25-30 mm. Fig. 983. Anteiioi end ol Ophidonais serpenlina. X 4°. (After Piguet.) 12(9) Capilliform setae present in dorsal bundles 13 13 (21) First anterior dorsal setae on V or VI 14 14 (18) Posterior end not modified into a gill-bearing respiratory organ; first anterior dorsal setae on VI. iS 15 (16,17) One or more capilliform setae of VI much longer than those of other somites and equal to three or four times the diameter of the body Slavina Vejdovsky 1883. S. appendiculala (d'Udekem), common in some parts of the United States, has body surface studded with sensory papillae and with foreign bodies. 16 (15,17) Prostomium elongated to form a proboscis; dorsal setae of VI similar in length to those of other somites. Stylaria Lamarck 1816. 5. lacustris (Linnaeus) has proboscis flanked by promi- nent lateral prostomial lobes (Figs. 980 and 984). S. fos- sularis Leidy lacks the lateral prostomial lobes (Fig. 984). The former is abundant and widely distributed in the United States while the latter is reported only very infre- quently. Fig. 984. Prostomium and proboscis, Stylaria. A, S. lacustris^ X40. (Original.). 17 (is, 16) Without proboscis; dorsal setae of VI similar in length to those of other somites Nais Miiller 1774. Several species without conspicuous differences are reported from the United States. A''. elinguis Miiller is one of the best-known species and A'', com
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
