240 Part I1I,—Twelfth Annual Report 
two at theapex. The secondary branch is comparatively small and broadly ; 
sub-ovate, with a somewhat bifid apex, and bears one seta on the inner 
margin, one on the outer margin, and one on each lobe of the bifid apex. 
Caudal stylets very short. 
Habitat.—Vicinity of the Bass Rock. Rather scarce. 
Remarks.—This is a small species, and resembles Shera uma in 
several of its characters ; but the short anterior antennz, and the large 
basal joint, and comparatively sinall and broadly ovate secondary joint 
of the fifth pair of thoracic feet, readily distinguish it from that species. 
Stenhelia denticulata, I. C. Thompson. 
1893. Stenhelia denticulata, I. C. Thompson (33), p. 20, pl. xxx. 
figs. 1-11. 
1894. Stenhelia denticulata, T. and A. Scott (31), p. 146. 
Habitat.—Off St Monans, and in the vicinity of Inchkeith Island. 
Mr I. C. Thompson obtained the two specimens, from which he de- 
scribed the species inside the breakwater, at Port Erin, Isle of Man. 
Several specimens have been captured in the Firth of Forth. This is a 
comparatively large and well-marked species. The anterior antenne are 
moderately long and slender, and eight-jointed. The second joint from 
the base is armed with a strong forward-projecting tooth. 
Genus Ametra, Boeck (1864). 
Ametra reflexa, sp. n. (PI. V. figs. 20-28.) 
Description.—Female. Body moderately robust. Length, 68 mm. 
goth of an inch). Anterior antenne short, stout, and eight-jomted. The 
first two joints are large, the others are small, the penultimate being shorter 
than any of the others. The upper distal portion of the fourth joint is 
produced forwards so as to form the base of a long filiment. The pro- 
portional lengths of all the joints are nearly as in the formula :— 
16." fds Coo AoA S 
Lijti Biases Go rae hare ee 
Posterior antennz short, two-jointed. A small secondary branch springs 
from near the middle of the first joint, and is furnished with three 
terminal sete (fig: 22). Mandibles small. Mandible-palp one-branched. 
The basal joint is small, and bears a single short terminal seta. The 
small one-jointed branch springs from the upper part of the external margin 
of the basal joint, and bears one marginal and three apical sete (fig. 23). 
Posterior foot-jaws short, moderately stout, consisting of two sub- 
equal joints, the lower rounded margin of the second joint ciliated. 
Terminal claw nearly straight, and rather longer than the joint from 
which it springs (fig. 24). Both branches of the first four pairs of 
swimming-feet three-jointed ; the outer branches of the first pair reach 
slightly beyond the end of the second joint of the inner branches, -The 
first joint of the inner branches is stout, and somewhat longer than the 
second joint, and bears 1 moderately long plumose seta near the middle 
of the inner margin. The second joint—which is rather smaller than the 
first —is furnished with a similar seta near the distal end; while the 
last joint, which is slender, and fully one and a half times the length of 
the second, is provided with one moderately short and two long sete at 
the apex, and three smal! spiniform sete on the inner margin, ‘The first 
and second joints in both branches are strongly ciliated on the outer 
margin. The first two joints of the ouver branches are each armed with 
‘a moderately long marginal spine, and the last joint with two shorter 
marginal spines, and three plain terminal sete (fig. 25). The outer 
