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It is true that G. H. FOWLER in his work of 1909 eounts from the older to the y ounger
stages, as I do, but he denotes the oldest mature stage, not the oldest larval stage, as Stage I.
As a result of this the oldest larval stage in the genus Conchoecia is termed Stage III in this
work, as this writer assumes that this genus is characterized by two mature stages which differ
from each other. It is to be noted that in several Ostracod groups moults — characterized by small
growth-factors and inconsiderable morphological alterations — occur after ma tu rity is attained.
So far, however, we do not know which groups are characterized by post-larval moults; it is not
impossible that different species in the same genus differ from each other in this character. Nor do
we know how many larval moults the different species are characterized by. From these reasons
it may be evident that it is not convenient to follow the terminology used by G. H. Fowler.
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