CANTHOCAMPTUS. at 
small (fig. 9). Inner segment of the basal joint of the 
fifth pair of feet (fie. 10) in the female, elongated, 
fringed, bearing two long and three short apical sete ; 
second or outer joint sub-ovate, finely fringed intern- 
ally; externally bearing six long marginal sete. In 
the male the limb is smaller, the basal joint short, 
broad, and having six short sete of equal length 
(fig. 11); second joint nearly like that of the female. 
Caudal segments (fig. 12) somewhat longer than 
broad; inner seta about twice as long as the 
outer ; anal operculum denticulated. Length goth of 
an inch (‘65 mm.). 
C. hibernicus occurs plentifully in the Mullingar 
Canal at Dublin, and in a lake near Newport, county 
Mayo; for specimens from both of these places I am 
indebted to my friend Mr. David Robertson, of Glasgow. 
From C. minutus, which must be considered as the 
type of the genus, it differs essentially in having the 
inner branch of the fourth foot 3-jointed; but in all 
other important particulars its characters are those of 
a true Canthocamptus. 
8. CANTHOCAMPTUS PALUSTRIS, nov. sp. Pl. XXXIX, 
figs. 13—23. 
Anterior antenna of the female slender, 8-jointed ; 
second joint the largest ; last two much more slender 
than the rest (fig. 13). In the male itis more robust, the 
fifth and sixth joints coalescent (fig. 14), and forming 
