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The sectio Cladocopa included a genus Polycope that was quite unknown before; the
sectio Platycopa was based on a genus Cytherella, previously known only incompletely from
fossil specimens. The families were divided by this author directly into genera and species.
GI. S. Brady in his work 1868 b adopts the above-mentioned classification of SARS’s; his
work is noteworthy because of the establishment of a new family, Entomoconchidae, comprising
two genera, Entomoconchus and Heterodesmus. The question of the value of this family I shall
not discuss; I only wish to point out liere that the genus Heterodesmus, which is placed by
<f. W. MÜLLER, 1912, among „Ostracodum genera et species incertae
s e d i s“, may possiblv be regarded as a typical Cypridinid genus; cf. the note below on
the sub-genus Siphonostra. Entomoconchus is only known from fossil specimens.
G. 0. Sars carried out a rather important improvement of his above-mentioned system
in his work on the < » s trac o d s of the Mediterranean, 1887: in it he arranged the genera
Nesidea and Bythocypris as a separate family within the group Podocopa.
Another important thing was the establishment of the family DarwinuMdae as a new
unit within Podocopa (G. S. Brada’ and A. M. Norman, 1889).
Most of the investigators who have worked on this group have adopted unaltered the
fundamental principles for the Ostracod classification used by G. O. Sars. G. AV. MÜLLER,
however, adopted this system only in a modified form. In his large monograph, 1894, this
author classifies the Ostracods in the following way:
Tribus I. Myodocopa, comprising the families Cypridinidae, Halocypridae and Polycopidae.
,, II. Podocopa, ., ,, ,, Cypridae, Nesideidae, Cytheridae, Cytherellidae,
and Darwin id id ae.
In other words, of G. O. Sars’ four sections G. AV. MÜLLER unités Cladocopa with
Myodocopa and Platycopa with Podocopa.
Only one author, C. ÜLAUS, entirely rejects the basis given by J. D. Dana for the
Ostracod system. He looks upon the Cypridinid s, Halocyprids, C y p r i d s and
Cytherids as équivalent families. See C. CLAUS, 1876, p. 97 and 1891a, p. 6.
G. S. Brady and A. M. Norman, 1896, who, like G. O. Sars, look upon the Po ly
copi d s and the Cytherellids as groups systematically équivalent to Myodocopa and
Podocopa, classify Myodocopa in no less than five families:
Family I. Asteropidae
,, II. Cypridinidae
,. III. Rutidermatidae
I V. Sarsiellidae
V. Halocypridae*.
In other words these authors do not, like G. AV. MÜLLER, look upon the H a 1 o c y p rids
as a group systematically équivalent to the P o 1 y c o p i d s and the Cypridinids, but as
* This is the naine that is used for this family on p. 682; in the beginning of the same work. however, these
investigators use the naine Conchoeciidae. see pp. 622 and 625, or Conchoeciadae. pp. 627 and 628.
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