of the Fishery Board for Scotland. 229 



and rather longer than the last, and the whole inner branch is rather 

 shorter than the first two joints of the outer branch. In the male the 

 last 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 

 much 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. 



Moravia anderson-smitki was obtained ingatherings 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, Moravia, and 

 Mesochva, — 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 crypiorum y Attheyella spinosa has both 

 branches of the first pair of swimming feet three-jointed and of moderate 

 length, while in Attheyella cvyptovum the first pair is short, with the 

 inner branches composed of two nearly equal joints. Moreover, in 

 Attheyella spinosa,' the male antennae and the inner branches of the male 

 third pair of feet, are strikingly different from those of Attheyella 

 cvyptovum. On the other hand, Mesochra lilljebovgii 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 Mesochva 

 robertsoui has the first pair short, both branches of about equal length, 

 and with the inner branches composed of two subequal joints, thus differ- 

 ing very distinctly from Mesochra lilljebovgii, but agreeing very closely 

 with Atheyella cvyptovum and with Attheyella propinqua. After sum- 

 marising all the points ill which the various species referred to agree and 

 in which they differ, we are inclined to think that, while Attheyella 

 spinosa and Mesochra lilljeborr/ii may be considered as the types of the 

 genera to which they belong, the others, Attheyella cryptovum, Attheyella 

 propinqua, and Mesochva robevtsoni, 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 Cypridid^e. 



Genus Cypvia, Zenker. 



Cypria serena (Koch). 



1838. Cypvis serena, Koch, Deutchlands Oustaceen, H. xxi. 22. 



