CANTHOCAMPTUS. 55 
occurs also in a brackish-water gathering taken by the 
Rey. A. M. Norman at Isle Oronsay, Skye. 
It may be readily distinguished at sight from 
Tachidius by its somewhat greater size, and more 
slender and graceful figure, as well as by the longer 
antenne. 
4. CANTHOCAMPTUS TRISPINOSUS, nov. sp. Pl. XLV, 
figs. 15—22. 
Anterior antenna 9-jointed (fig. 15), slender, the 
last joint very small, third and sixth long, fifth short, 
bearing numerous rather short hairs ; inner branch of 
the posterior antenna small, 1-jointed. Mandible-palp 
minute. Lower foot-jaw moderately strong (fig. 19), 
second joint having two slender spines on the external 
margin. First pair of feet exactly lke those of Can- 
thocamptus minutus. Inner branches of the second, 
third, and fourth pairs short, 2-jointed (fig. 20), the 
first jomt very small, the second elongated. Basal 
joint of the fifth foot of the female (fig. 21) not at all 
produced downwards, bearing three strong plumose 
setee and a fringe of several minute cilia on the inner 
margin ; second joint long and narrow, internal margin 
densely fringed with small hairs, external corrugated 
and bearded; one long and two shorter apical sete, 
and two on the external margin, all of which are 
strongly ciliated. The segments of the abdomen, 
except the last, are finely denticulated along the post- 
erior margins (fig. 22); anal operculum smooth; 
