ENHYDROSOMA. 99 
toothed, the palp elongated, its first and second joints 
each bearing one strong plumose seta, the last joint 
four apical setze. The second foot-jaw (fig. 18) is well 
developed, its terminal claw long and slender. Both 
branches of the first pair of feet (Pl. LXXXI, fig. 12) 
have two very long terminal setz, which bear near 
their apices three or four lash-like cilia. In the three 
following pairs the inner branch is very small and has 
three plumose terminal setze; the outer branch is of 
moderate size, and has three plumose setze at the 
apex, while the marginal spines are elongated, slender, 
and strongly pectinate. The fifth pair in the female 
(Pl. LXXXIT, fig. 19) has the first joint very broad 
and short, the internal segment fringed with five stout 
plumose setz; the second or outer joint is ovate, 
crenulated on the external margin, bearing on the 
inner margin two stout sete, and at the apex a short, 
broad spine. Inthe male (Pl. LXXXT, fig. 14) the fifth 
foot is smaller and is incompletely divided into two 
laminz, each of which bears four or five plumose seta. 
The caudal lamine are broadly ovate (fig. 15) and are 
provided with five minute marginal sete. The animal 
when seen from the side (Pl. LXXXII, fig. 11) is 
arcuate, the head and tail being sharply bent upon the 
body ; the integument glabrous. Length 3;th of an 
inch (‘67 mm.). 
I have not been able to identify this with either of 
the two species (H. curticauda and LH. longicaudata) 
described by M. Boeck, the fifth pair of feet being 
apparently quite different. MH. cwrvata, though occur- 
ring pretty plentifully in several widely separated 
