of the Chitons
have arisen either by metameric repetition within the group, or by the
gradual loss of an original connexion between the generative sac and the
renal tube, as in Lamellibranchs and Gastropods, the generative sac
acquiring a separate duct and opening to the exterior on each side.

LITERATURE.--A. Sedgwick, "On certain Points in the Anatomy of
Chiton," _Proc. R. Soc. Lond._ xxxiii., 1881; J. Blumrich, "Das
Integument der Chitonen," _Zeitsch. f. wiss. Zool._ lii., 1891; A.C.
Haddon, "Report on the Polyplacophora," _Challenger Reports. Zool._
pt. xliii., 1886; H.N. Moseley, "On the presence of Eyes in the Shells
of certain Chitonidae, and on the structure of these Organs," _Quart.
Journ. Mic. Sci._ new ser. xxv., 1885; A.A.W. Hubrecht, "Proneomenia
Sluiteri," _Nied. Arch. f. Zool._ Suppl. 1., 1881; A. Kowalewsky and
A.F. Marion, "Contr. a l'histoire des Solenogastres ou Aplacophores,"
_Ann. Mus. Marseille, Zool._ iii., 1887; A. Kowalewsky, "Sur le genre
Chaetoderma," _Arch. de zool. exper_. (3) ix., 1901; P. Pelseneer,
"Mollusca," _Treatise on Zoology_, edited by E. Ray Lankester, pt. v.,
1906; E. Ray Lankester, "Mollusca," in the 9th ed. of this
Encyclopaedia, to which this article is much indebted. (J. T. C.)

FOOTNOTE:

[1] The Gr. [Greek: chiton] was a garment in the shape of a loose
tunic, varying at different periods: see COSTUME: _Greek_.

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