144 BRITISH COPEPODA. 



excessively dilated, and produced anteriorly into an 

 overlapping, hood-like beak ; posterior antennae (fig. 5) 

 simple, biarticulate (?), the second joint armed with 

 six strong spines, one of which is very long. Man- 

 dibles (fig. 6) extremely small, with a small bisetose 

 palp. First pair of feet (fig. 7) short and thick; 

 internal branch 1- jointed, and bearing two strong 

 terminal spines, one longer than the other; external 

 branch 3-jointed, bearing at the truncated apex of the 

 last joint two spines similar to those of the inner 

 branch, and also two very long curved setae ; second, 

 third, and fourth pairs of feet (fig. 8) having both 

 branches triarticulate and nearly equal, more slender 

 than the first pair, each joint bearing at its apex a sub- 

 verticillate series of sharp slender spines. Abdominal 

 segments beset round the posterior margins with fine 

 spine-like setae, the last two cut into rectangular 

 notches. Caudal segments (fig. 10) very small, each 

 bearing one large and two small setae, the larger ones 

 curved, their anterior halves dilated and spathulate. 

 Colour dark vinous red ; skin excessively thick and 

 tough. Length ^th of an inch ('43 mm.). 



The habitat of this remarkable species is amongst 

 black peaty mud and roots of seaweeds at the upper 

 end of Rouudstone Bay, near high-water mark, where 

 it was found by Mr. Robertson and myself in 1872. 

 It is to be regretted that our specimens were not 

 noticed until after the mud in which they were taken 

 had been completely dried ; had we been able to pre- 

 serve them in spirit it is probable that more accurate 

 knowledge of the mouth-apparatus and some other 



