392 WILLIAM NICOLL. 
these groups or sub-families and the examination of their 
relationships seems to be of the greatest importance in 
leading up to the natural family groups. On that account I 
have endeavoured—not in every case with success—to include 
each of the genera described here in some sub-family group. 
Many systematic difficulties have been encountered in the 
course of this work, and I should like here to refer to the 
case of Campula oblonga Cobbold. It is almost a certainty 
that the form I am describing as Brachycladium 
oblongum (Brn.) is actually identical with Cobbold’s species, 
but according to the strict laws of nomenclature the name not 
only of Cobbold’s genus but also of his species must be 
regarded as nomen nudum. _ Ihave followed in this matter 
the authority of Looss and Odhner, but it seems to me that 
this particular species has been submitted to a test which, 
were it to be applied as rigorously, would prove fatal to many 
of the species and genera of older writers. There appears to 
be no escape from the trammels of nomenclature, and the 
only hope of simplifying matters consists in the submittal of 
each new or re-described species or other systematic unit to 
as strict a scrutiny as has been done in the case of Campula 
oblonga, ‘This can never be done effectually so long as the 
work of criticism remains in the hands of isolated individuals. 
There is undoubtedly a need for some central scheme, as has 
been already advocated more than once. 
The general anatomy and histology of the 'rematoda has 
been the subject of fairly exhaustive reseach, yet a few points 
still remain doubtful and disputable, e.g. the function of the 
so-called subcutaneous glands and the large cells of the 
suckers. The myoblastic nature of these cells, as demonstrated 
by Bettendorf, can hardly be said to have been conclusively 
proved, or at any rate some modification and extension of 
Bettendorf’s original views is necessary. ‘The large cells of 
the suckers appear to have little in common with the sub- 
cutaneous cells, In appearance and staining properties they 
resemble true nerve-ganglion cells. The subcutaneous cells 
bear a muchcloser resemblance to the small cells of the suckers. 
