CIROLANA, 295 
middle, with several powerful acute teeth and an inner 
movable lobe; the palpiform appendage is long, three- 
jointed, and bent over the base of the lower antenne. 
The pair of foot-jaws are moderately strong, composed 
of six nearly equal-sized joints, deeply ciliated along 
the inner edge; the first pair of maxilla are triangular, 
with the extremity narrowed, bearing an inner lobe of 
the same length as the extremity of the organ. The 
second pair of maxille are larger, stronger, and exarticu- 
late, with the extremity curved and acute, furnished near 
the base of the inner margin with a small movable 
quadrate lobe, the inner margin itself armed with strong 
bristles. The tail is not quite so broad as the body, with 
the four basal segments of equal size, transverse, the 
fifth as long as the preceding, but abbreviated on each 
side, with the posterior margin straight, and not arched 
as in the preceding segments. The last segment of the 
tail forms a large triangular smooth plate, on the outer 
anterior sides of which are affixed the lateral appen- 
dages, of which the inner plate is the larger: they do not 
extend beyond the extremity of the terminal segment. 
