. Fresh-water biology. Freshwater biology. PARASITIC ROUNDWORMS 551 35 (34) Proboscis with sixteen longitudinal rows of hooks. Arhythmorhynchus pumilirostris Van Cleave 1916. Female up to 30 mm. long, and mm. broad. Proboscis mm. long, mm. wide at base, mm. at tip, mm. at center. Embryos 65 to 89 ix long, 18 n broad. Middle shell with evagination at each pole. From bittern {Botaurus knliginosus); Washington, D. Fig. 8ss. ArJiythmorhynclius pumilirostris. Profile, anterior end of body. X 95. (After Van ©eave.) 36 (11) In anterior region of mature specimens prominen
. Fresh-water biology. Freshwater biology. PARASITIC ROUNDWORMS 551 35 (34) Proboscis with sixteen longitudinal rows of hooks. Arhythmorhynchus pumilirostris Van Cleave 1916. Female up to 30 mm. long, and mm. broad. Proboscis mm. long, mm. wide at base, mm. at tip, mm. at center. Embryos 65 to 89 ix long, 18 n broad. Middle shell with evagination at each pole. From bittern {Botaurus knliginosus); Washington, D. Fig. 8ss. ArJiythmorhynclius pumilirostris. Profile, anterior end of body. X 95. (After Van ©eave.) 36 (11) In anterior region of mature specimens prominent bulbous enlarge- ment, separated from body by slender cylindrical neck. 37 The bulb is embedded in the intestinal wall or may even be in the body cavity when the slender region traverses the wall connecting with the body of the parasite in the intestine. In handling such material the proboscis may easily be partly or completely torn off, and the para- site is then difficult to identify as the characteristic bulb at least is gone. 37 (38) Bulb consists of the proboscis, bulb in radial lines. Hooks on the anterior face of the (Females of) Filicollis Liihe 1911. Representative North American species. Filicollis botulus Van Cleave 1916. In females thus far reported under this name for North America the bulb is wanting; it may be present in older specimens and in fact is described in specimens recorded under the name E. analis which may belong here. Compare number 22 in key. 38 (37) Bulb consists of anterior part of neck only. Proboscis extends an- teriad from bulb. Pomphorhynchus Monticelli 1905. Proboscis long, cylindrical, with many hooks. Neck very long, expanded in anterior region, slender, cylindrical in posterior portion. In intestine of fishes; one of the commonest types in European fresh-water hosts. Not infrequent in North American fresh-water fishes; species not described. IMPORTANT REFERENCES ON NORTH AMERICAN PARASITIC ROUNDWORMS GENERAL WORKS See also Ust in Chapter
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