AETOTROGUS. 63 



inner branch of tlie fourth foot is small, almost desti- 

 tute of setge, and terminates in two very small spines 

 (fig. 7). Fifth pair of feet (fig. 8) 1-jointed, quadrate, 

 bearing one long and two short apical setse. Shell 

 structure (fig. 9) areolated, finely punctate. 



One specimen dredged in a depth of fifteen fathoms 

 off Portincross, Ayrshire, and one in thirty fathoms off 

 Red Cliff, Yorkshire. 



3. Aetoteogus Noemani {Brady andBohertson). PI. XCI, 



figs. 12—15 ; PI. XOTI, fig. 

 14; andPl. XCIII, fig. 10. 



Dyspontius Normani, B. & R. Brit. Assoc. Report, p. 197 (1875). 



This is, in general appearance, much like the pre- 

 ceding species ; the abdomen of the male (PI. XCIII, 

 fig. 10) is elongated, and has the last joint dilated 

 distally and longer than either the second or third 

 joints ; caudal appendages wide, and shorter than the 

 last abdominal joint, each bearing four subequal plu- 

 mose setse, the longest of which is not more than equal 

 to the last three abdominal somites. Anterior an- 

 tenna (PL XCI, fig. 12) 9-jointed, stout, its outer 

 margin and apex bearing numerous short subequal 

 setae ; the relative lengths of the joints are as follows : 



1, 2, 3, 4, 5. 6, 7, 8, 9. 

 84 11 444358 



Posterior antenna simple, composed of four nearly 

 equal joints (fig. 13), and bearing three small terminal 



