HAPLODRILI (so called by Lankester)

This article appears in Volume V12, Page 934 of the 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

section

SECTION
SECTION (Lat. sectio, cutting, secare, to cut)

of Polygordius. (From Fraipont.)
C, Trochophore of Polygordius. and D, later stage of the same, showing the development of the trunk. (From Hatschek.)
E, Dorsal view of Dinophilus taeniatus.
F, Male apparatus of the sa ne (From Harmer.)
a, Anus.
ap, Apical organ.
c, Coelom.
c.o, Ciliated pit.
c.t, Cuticle.
d.v, Dorsal

vessel

VESSEL (O. Fr. vaissel, from a rare Lat. vascellum, dim. of vas, vase, urn)

.
e, Eye.
ep, Epidermis.
g,f, Genital funnel.
h, "Head kidney," with second nephridium just below it.
i,

Intestine

INTESTINE (Lat. intestinus, internal, usually in neuter plural intestina. from intus, within)

.
Lm, Longitudinal muscles.
m, Mouth.
m.o, Muscular pharyngeal organ. m.p, Male

pore

PORE

.
n, Nephridium.
o.m, Oblique muscles.
ov, Ovary.
p, Penis.
pr, Prototroch.
pt, Prostomial tentacle.
sp, Sperm-sac.
spd, Sperm-duct.
si, Stomach.
t, Testes.
tr, Trunk segment.
tt, Telotroch.
v.n, Ventral

nerve

NERVE (Lat. nervus, Gr. vevpov, a bowstring)

cord.
v.v, Ventral

vessel

VESSEL (O. Fr. vaissel, from a rare Lat. vascellum, dim. of vas, vase, urn)

.
interesting lowly-organized marine worms, whose affinities are very doubtful (see 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

Annelida

ANNELIDA

before setae were developed, have lost the setae, which -are already in a reduced 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,"

Fauna

FAUNA

Flora

FLORA

d. Golfes v. Neapel., xiv., 1887; Weldon, " Dinophilus gigas," Quart. Journ. Micr. Sci. vol.

xxvii

XXVII

., 1886; Harmer, " Dinophilus," Journ. Mar. Biol. N.S. vol. i., 1889; Schimkewitsch, " Entwickl. des Dinophilus," Zeit. f. wiss. Zool. vol. lix., 1895; Korschelt, " ~} V ber Bau u. Entw. des Dinophilus," Zeit. f. wiss. Zool. vol. xxxvii., 1882; Foettinger, " Histriobdella,"

Arch

ARCH
ARCH, JOSEPH (1826– )

. Biol. vol. v., 1884; Goodrich, " On Saccocirrus," Quart. Journ. Micr. Sci. vol. xliv., 1901. (E. S. G.)

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