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 setai, 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 setae. In the third pair the last joint bears two 

 terminal and two submarginal spines, and two marginal 

 setse. In the fourth pair the last joint is armed 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 one short seta on the external 

 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 setae, 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 

 length of the next, and somewhat dilated ; the other three 

 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 setae, 

 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 



