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équivalent to the sub-groups of the C y p r i d i n i d s. A. SCOTT, 1905, and A. M. Nohman. 1905,
also employ the saine classification.
G. \V. MÜLLER, however, even in his later works, araong others that of 1912, which to
soine extent may be said to form a conclusion to an epoch of the historv of Ostracod
investigation, uses unaltered the fundamental classification that he worked out in 1894. In
this lie is only followed by T. R. R. Stkubing, 1910.
Since then the system has been enlarged by a number of families being divided into a
greater or less number of sub-families. For this development I must refer the reader to the
historical résumés given under the sub-orders.
At a very early date it was surmised that the Ostracods would prove to be one
of the groups richest in species within the Entomosiraca and time has not disproved this. Thus
G. W. MÜLLER in his synoptic work 1912 records no less than 1719 described recent
species. To judge, however, from the latest works and from my own expériences in working
out the present treatise, this figure seems by no means to be the limit. At the present time
there seems to be on the earth an Ostracod kingdom enormously rieh in forms. Under
these circumstances it is, of course, absolutely necessary to take the utmost care in introducing
new forms into the litera ture, otherwise this will soon be quite unwieldy. This seems, however,
not to have been recognised by most of the investigators who have been occupied with the
systematization of the Ostracods. This may perhaps best be illustrated by G. W. MÜLLER’s
statement (1912) that only 921 out of the 1719 species recorded by him could be considered as
„certain“; in reality the proportion between „certain“ and „uncertain“ species is proba bly
even more discouraging. This lack of care applies especially to the works of G. S. BRADY, one
of the most productive authors in this departement. It must be admitted that most, almost
all, the descriptions of species that this industrious author has published are so incomplete
and uncertain that they are quite insufficient for füll certainty of identification. Instead of
advancing our knowledge of the Ostracods most of this author’s work has only rendered
the study of this group of animais more difficult. But even the most eminent of our < Istracod
investigators — G. \V. MÜLLER not excepted, this applies especially to some of this author’s
later works — can scarcely be acquitted of the charge of superficial descriptions. One must
admit, unfortunately, that the method of description of species within this group is still at
rather a low level.
Remarks: — As appears from the preceding historical survey, there are, with regard
to the main lines for the systematic classification of the Ostracod group, three separate
and mutually opposed views present in the literature of the subject, namely those of G. O. Sars,
G. W. Müller and C. Claus.
According to G. O. Sars this group is to be divided in the following way:
Sectio I. Podocopa, comprising the families Ci/pridae, Darwinvhdae. SesUh idae. and ( ’t/theridae
,, II. Myodocopa, ,, ,, •• Cypridinidae and Halocypridae
„ III. Cladocopa, „ .. familv Polycopidae
„ IV. Platycopa ., .. .. Cytherellidae.
Description nf ihr
species.
\ attirai system.
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