152 ANNALS OF SCOTTISH NATURAL HISTORY 
furnished with a moderately long terminal spine; there is 
also a small marginal bifid process on the one side, while a 
small seta springs from the margin on the other side (Fig. 5). 
The last joint of the anterior foot-jaw terminates in four 
moderately large subequal sub-marginal spines, and a small 
lateral spine springs from near the proximal end of the joint 
(Fig. 6). Posterior foot-jaw rudimentary, moderately broad 
and stout, and having a very small subterminal tooth-like 
process (Fig. 7). The first, second, third, and fourth pairs of 
swimming-feet nearly alike ; both branches short (the inner 
rather longer than the outer one), and three-jointed (Figs. 8 
and 9). The armature of the inner branches differs to some 
extent, especially in the following manner: the last joint 
of the inner branches of the first pair is provided with one 
submarginal short and stout dagger-shaped spine, and 
round the distal end with five moderately long sete, as 
shown in Fig. 8. In the second pair the last joint bears one 
terminal and two submarginal dagger-shaped spines, which 
are rather longer than that of the first pair, and three sub- 
marginal sete. In the third pair the last joint bears two 
terminal and two submarginal spines, and two marginal 
setae. In the fourth pair the last joint ism@@fmed with the 
same number of spines as in the third pair, but with only 
one marginal seta, as shown in Fig. 9. Fifth pair elongate, 
foliaceous, furnished with ome short Seta ‘on the fextermal 
margin and near the distal end; immediately anterior to the 
seta is a number of small marginal teeth. The somewhat 
truncate extremity of the foot bears three setz, the middle 
one of which is very small, while the other two are moder- 
ately long and stout, and nearly of equal length (Fig. 10). 
Abdomen four-jointed, the first segment about twice the 
leneth of the mext, and ‘somewhat dilated; the othenmmines 
segments are subequal, the last being rather longer than either 
of the other two. Caudal stylets rather longer than the last 
abdominal segment, and about three times as long as broad ; 
each stylet is furnished with several terminal plumose sete, 
and with one seta near the middle of the exterior margin. 
Habitat—Off St. Monans, Firth of Forth. One 
specimen only (a female) of this interesting species was 
obtained, and is recorded (but not described or figured) in 
