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HAPLODRILI (so called by Lankester)

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Originally appearing in Volume V12, Page 934 of the 1911 Encyclopedia Britannica.
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HAPLODRILI (so called by Lankester) , often called Archiannelida (Hatschek), the name provisionally given to a number of A, Polygordius neapolitanus. (From Fraipont.) B, Transverse See also:section of Polygordius. (From Fraipont.) C, Trochophore of Polygordius. and D, later See also:stage of the same, showing the development of the See also:trunk. (From Hatschek.) E, Dorsal view of Dinophilus taeniatus. F, Male apparatus of the sa ne (From Harmer.) a, Anus. ap, Apical See also:organ. c, Coelom. c.o, Ciliated See also:pit. c.t, Cuticle. d.v, Dorsal See also:vessel. e, See also:Eye. ep, Epidermis.

g,f, Genital See also:

funnel. h, "See also:Head See also:kidney," with second nephridium just below it. i, See also:Intestine. Lm, See also:Longitudinal muscles. m, Mouth. m.o, See also:Muscular pharyngeal organ. m.p, Male See also:pore. n, Nephridium. o.m, Oblique muscles. ov, Ovary. p, Penis. pr, Prototroch. pt, Prostomial tentacle.

sp, Sperm-See also:

sac. spd, Sperm-duct. si, See also:Stomach. t, Testes. tr, Trunk segment. tt, Telotroch. v.n, Ventral See also:nerve See also:cord. v.v, Ventral vessel. interesting lowly-organized marine See also:worms, whose See also:affinities are very doubtful (see See also:CHAETOPODA). Polygordius and Protodrilus Whatever may be the conclusion as to the position of Dinophilus and Histriodrilus, it seems only reasonable to suppose that Polygordius and Protodrilus, so far from representing a stage in the phylogeny of the See also:Annelida before setae were See also:developed, have lost the setae, which -are already in a reduced See also:state in Saccocirrus. AUTHORITIEs.—Hatschek, " Studien z. Entw. der Anneliden," Arb.

Zool. Inst. Wien, vol. i., 1878; " Protodrilus," ibid. vol. iii. (1881); Fraipont, "Le Genre Polygordius," See also:

Fauna u. See also:Flora d. Golfes v. Neapel., xiv., 1887; See also:Weldon, " Dinophilus gigas," Quart. Journ. Micr. Sci. vol. See also:xxvii., 1886; Harmer, " Dinophilus," Journ. See also:Mar. Biol.

N.S. vol. i., 1889; Schimkewitsch, " Entwickl. See also:

des Dinophilus," Zeit. f. wiss. Zool. vol. lix., 1895; Korschelt, " ~} V ber Bau u. Entw. des Dinophilus," Zeit. f. wiss. Zool. vol. See also:xxxvii., 1882; Foettinger, " Histriobdella," See also:Arch. Biol. vol. v., 1884; See also:Goodrich, " On Saccocirrus," Quart. Journ. Micr. Sci. vol. xliv., 1901. (E. S.

End of Article: HAPLODRILI (so called by Lankester)

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