226 Part I11—Eleventh Annual Report 
The male antenne are considerably dilated. There is a constriction 
between the third and fourth joints ; the articulation between these forms.a 
hinge to enable the antenne to be used for grasping; the fifth joint is 
small, and bears a short stout spine on its upper distal angle, while the 
. sixth joint is furnished with a sensory filament. Tirst pair of swimming feet 
short, the outer branch three-jointed, the inner two-jointed, both, branches 
of about equal length, the basal joint of the inner branch stouter and 
rather shorter than the other ; the margins of both joints are fringed with 
short spiniform sete ; the last jot bears at its distal extremity a mode- 
rately short plumose spine, and one short and one long bent subterminal 
seta; each of the three joints of the outer branch is armed exteriorly 
with a subterminal and somewhat stout plumose spine, the second joint 
carries a moderately long seta on the inner distal angle, while the last 
joint carries two terminal and one long bent subterminal sete (fig. 24). 
Inner branches of the third pair scarcely longer than the first two joints 
of the outer branch, first joint very short; in the male the first joint 
bears a long stout setaform appendage, which is at least two and a half 
times the length of the inner branch; there is a small seta at the base of 
the appendage ; the only armature of the second joint—which is somewhat 
lageniform—consists of two terminal plumose sete, one being much longer 
than the other (fig. 27). Inner branches of the fourth pair shorter than 
the first two joints of the outer branch, first jomt very small; the arma- 
ture of both branches somewhat similar to that of the third pair (female). 
Wifth pair small, foliaceous ; in the female the basal joint bears four long 
aund two short plumose sete ; the long sete are arranged as follows :—one 
on the inner and one on the outer margin near the somewhat truncate 
extremity, and two of them terminal, one of which is considerably longer 
than either of the other three ; the two short setz spring from the inner 
margin, as shown in the: figure (fig. 29); the second joint is smaller, 
obliquely truncate, and provided with five sete, as shown in the figure. 
Tn the male the basal joint is boldly convex, and bears two short plumose 
terminal sets, second joint small subovate, furnished with one stout, 
coarsely plumose, and moderately long terminal seta, and two small setz on 
the inner and three on the outer margin (tig. 30). Abdominal segments 
ornamented with two concentric rows “ot small prickles—one row near the 
lower and one near the upper margin, but the last row is not so con- 
spicuous as the other. ‘The opercular plate has the edge strongly aculeate. 
Caudal stylets short, somewhat dilated, and provided with two long ter- 
minal unequal sete, one being about twice the length of the other, and 
a few short hairs (fig, 31). 
This species was described by Dr Brady from specimens obtained by 
Mr Thomas Atthey, amongst gelatinous algz growing on the roof of the 
pit-workings of the low main West Cramlington Colliery, near New- 
castle, in 1868: so far as I can learn, it was not known to occur any- 
where else till it was obtained in Loch Morar during our examination of 
that loch. Specimens were sent to Dr Brady, and he was able to recog- 
nise them as belonging to the species he had described from the West 
Cramlington Colliery. 
It may be of interest to note here, that quite recently, when examining 
some material collected by hand-net in the vicinity of Harelaw Dam, Balerno, 
near Edinburgh, in August 1890, and which had not been examined pre- 
viously for want of time, several specimens of this interesting species were 
observed, thus indicating that its distribution may not be so restricted as 
had been supposed. Its occurrence among the gelatinous alge on the roof of 
the pit-workings at West Cramlington is very curious and j interesting, and 
opens up questions respecting distribution of species which, like that of 
the ‘toad in the rock,’ may not be easily solved. 
