. Fresh-water biology. Freshwater biology. FREE-LIVING NEMATODES 48s II (12) Pharynx simple, male supplementary organs not in fascicles. Dorylaimus Dujardin. Genus consisting, no doubt, of hundreds of species, and inhabiting soil, fresh water^ and, to a limited extent, brackish water. They feed so far as known on vegetable matter, most commonly, it is believed, on the roots of plants which they pierce by means of the hollow oral spear. Representative species. Dorylaimus fecundus Cobb 1914. i-. .5 .J 48 -M- 99. _. Habitat: Algae, Potomac River, Wash- ington, D. C. Fig. 779.
. Fresh-water biology. Freshwater biology. FREE-LIVING NEMATODES 48s II (12) Pharynx simple, male supplementary organs not in fascicles. Dorylaimus Dujardin. Genus consisting, no doubt, of hundreds of species, and inhabiting soil, fresh water^ and, to a limited extent, brackish water. They feed so far as known on vegetable matter, most commonly, it is believed, on the roots of plants which they pierce by means of the hollow oral spear. Representative species. Dorylaimus fecundus Cobb 1914. i-. .5 .J 48 -M- 99. _. Habitat: Algae, Potomac River, Wash- ington, D. C. Fig. 779. Dorylaimus fecundus. At the right, head and tail of a female; at the left, tail end of a male, a, apex of spear, showing oblique opening; b, papilla of the anterior circlet: c, papilla of the posterior circlet; d, guiding-ring for the spear; e, commencement of the esophagus, /, pre-rectum; g, rectum; h, anus; i, anal muscles; j, caudal papilla; k, outer cuticula; /, inner cuticula; m, muscular layer; », pre- rectum; o, one of the numerous oblique copu- latory muscles; p, one of the ventral series of male supplementary organs; q, ejaculatory duct; r, pair of pre-anal papillae; s, retractor muscles of the spicula; /, muscular layer; m, right spiculum; t, accessory piece. (After Cobb.) 12 (11) Pharynx with complicated radiate framework, male supplementary organs in fascicles Actinolaimus Cobb. Genus represented in all parts of th world, and proposed for species similar to Dorylaimus labyrinthostonius, in which the pharynx is more or less immobile, radially striated and elabo- rately constructed. Representative species. Actinolaimus radiatus Cobb 1913. e. .3 6 4 [9 â¢Â» «. ,.- ^ 9 ] 5 17 2 i~4~ 'â¢*" The esophagus begins Cr â ' "â "â -"- "' < 1 m, as a tube about one- ^" 'â '<â 'â 'â ""'* â third as wide as the cor- responding portion of the neck. It continues to have this width for some distance. Considerably in fr
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
