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After the elimination of these divergent elements the genus Cypridina (sensu
G. W. MÜLLERI) may certainly be said to have become considerably more uniform.
A further division of it appears, however, to be particularlv desirable. — The incompleteness
and uncertainty of the diagnoses and figures of the majority of the remaining species are, however,
so great that any attempt at the present moment to carry out a natural arrangement and division
of all these forms must be considered prématuré and inconvénient.
A fairly large number of species belonging to this genus were found in the material that
formed the basis of the present treatise. Because of this it seemed to me necessary, in spite
of the difficulty of the task, to attempt even now to carry out a partial division of the genus in
question. In doing this I have, of course, chiefly taken into account the forms that I myself
have had occasion to investigate closely. I have tried, however, as far as possible, to show the
relations of these forms to species that have been previously dealt with in the literature.
As a result of this attempt I have established four new sub-genera, as shown below; these
sub-genera are:
Doloria
Vargula
il I acrocypridina
Siphonostra.
The sub-genus Vargula is based on three species investigated by me but already described
previously, namely Cypridina norvegica W. Baird, C. antarctica G. W. MÜLLER and C. megalops
G. O. SARS. Besides these three species a large number of the forms included by G. W. MÜLLER
under the name of Cypridina are probably to be referred to this sub-genus. That under these
circumstances the name Cypridina has not been retained for these species, but that in the present
work this name has been made to replace the entirely rejected generic name Pyrocypris, will
be found explained below; see note under the sub-genus Cypridina. — Macrocypridina
comprises only one species, Cypridina castanea established by G. S. Brady, 1897. — The
two remaining sub-genera, Doloria and Siphonostra, are based on species previously unknown
to science. Whether anv previously described species belongs to the sub-genus Doloria, I cannot
say. To the sub-genus Siphonostra possibly belongs, besides C. (S.) spinifera described below,
Cypridina nobilis P. T. < ’LEVE. With regard to the relationship of the last-mentioned sub-genus
to Cypridina hirsuta G. W. MÜLLER and the extremely incompletely known genus Heterodesmus
established by G. S. Brady see below, note under the sub-genus Siphonostra. — With regard
to the characters by which these sub-genera are distinguished I merely refer here to the diagnoses
of these groups given below.
It is true, on the one hånd, that all these four sub-genera are undoubtedly fairly closely
related, but on the other hånd they show such great differences from each other that it seems
to me quite correct to distinguish them. I have had some doubt as to whether it is most
convenient to denote these groups as genera or sub-genera. The relatively close relationship
that exists between these groups in comparison with most of the previously established genera
of this sub-family has induced me to put forward these new units as sub-genera. The question
is, however, not a very important one........
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