i. oe 
of the Fishery Board for Scotland. 229 
and rather longer than the last, and the whole inner branch ts rather 
shorter than the first two joints of the outer branch. In the male the 
ast joint of the inner branch of the second pair is much smaller than the 
first, and is armed with a long terminal spine and a subterminal seta ; the 
first joint bears a stout conical tooth-like process, slightly hooked at the 
end on the outer aspect, and a seta on the inner margin. The fourth 
pair have the inner branches scarcely reaching to the middle of the second 
joint of the outer branches ; the spines of the first and second joints are 
‘inuch longer than the joints to which they are attached ; the inner of the 
three terminal spines of the last joint, is of considerable length, and, like 
‘the middle spine, is ciliate along one side. Fifth pair in both sexes some- 
what similar to Attheyella, but the armature is shorter and stouter (figs. 
25,26). Caudal stylets about equal in length to the last abdominal 
segment. The abdomen in the male consists of five, in the female of four 
segments, the first and second segments in the female being coalesced. 
Moraria anderson-smithi was obtained in gatherings of bottom material 
both from the head of the loch and from Brinacory ; it appeared to be a 
rather scarce species in both gatherings, but was, if anything, more frequent, 
in the last. 
During our study of the closely allied genera,— Attheyella, Moraria, and 
Mesochra,—it seemed to us that the first and last of these, included species 
that differed considerably from each other. For example, Attheyella 
spinosa (including the male form) appears to belong to quite a different 
type from that of Attheyella cryptorum; Attheyella spinosa has both 
branches of the first pair of swimming feet three-jointed and of moderate 
length, while in Attheyella cryptorum the first pair is short, with the 
inner branches composed of two nearly equal joints. Moreover, in 
Attheyella spinosa,'the male antenne and the inner branches of the male 
third pair of feet, are strikingly different from those of <Attheyella 
eryptorum. On the other hand, Mesochra lilljeborgiu has the inner 
branches of the first pair elongate and two-jointed, the first joint being 
longer than the entire length of the outer branch; while Mesochra 
robertson. has the first pair short, both branches of about equal length, 
and with the inner branches composed of two subequal joints, thus ditier- 
ing very distinctly from Mesochra lilljeborgit, but agreeing very closely 
with Atheyella cryptorum and with Attheyella propingqua. After sum- 
marising all the points in which the various species referred to agree and 
in which they differ, we are inclined to think that, while Aétheyella 
spinosa and Mesochra lilljeborgit may be considered as the types of the 
genera to which they belong, the others, Attheyella cryptorum, Attheyella 
propingua, and Mesochra robertsont, form a distinct and closely related 
group, which if removed from the genera where they are at present 
located and included in a separate genus:or subgenus, the systematic study 
of these various forms would be somewhat simplified. 
OSTRACODA: 
PODOCOPA. 
Family Cypripip&. 
Genus Cypria, Zenker. 
Cypria serena (Koch). 
1838. Cypris serena, Koch, Deutchlands Crustaceen, H. xxi. 22. 
