144: BRITISH COPEPODA. 
excessively dilated, and produced anteriorly into an 
overlapping, hood-like beak; posterior antennz (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 sete ;. 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 
seoments beset round the posterior margins with fine 
spine-like sete, the last two cut into rectangular 
notches. Caudal segments (fig. 10) very small, each 
bearing one large and two small setze, the larger ones 
curved, their anterior halves dilated and spathulate. 
Colour. dark vinous red; skin excessively thick and 
tough. Length sth 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 Roundstone 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 1s probable that more accurate 
knowledge of the mouth-apparatus and some other — 
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