LIFE-HISTORY OF CARTEROCEPHALUS PALAUMON. 227 
whitish green; a longitudinal medio-dorsal line rather dark 
green, which is bordered on each side by an almost white, very 
fine line, followed by alternate darker and lighter lines, the 
lightest being extremely fine; then a subdorsal darker green 
line, bordered laterally by a conspicuous whitish line, which is 
again bordered below by a paler and indistinct green line, and a 
very faint spiracular whitish stripe, on which the spiracles are 
placed ; they are white, outlined by a dark but indistinct ring ; 
the under surface is whitish green; the head is about the same 
width as the body, rather depressed, and of a pale greenish grey 
colour with black markings, one central between the lobes, and 
one down the middle of each lobe, the central one bifurcating 
and uniting the others in front; the eye-spots are black; both 
the head and body are clothed with very short stiff hair; the 
anal segment is elongated, porrected, and flattened, overlapping 
the hind claspers; the central black marking previously men- 
tioned is in this stage very conspicuous ; the legs are dark grey, 
with whitish extremities; the claspers the same colour as the 
under surface; the segments are transversely wrinkled. 
Fourth moult, and last, took place on L7th August, or 
possibly early on the 18th, as on that morning I found its cast 
head-skin lying below the tube in which it moulted. About 
four p.m. that day I expelled it from the tube by gently touching 
its head, when it instantly ran out backwards. I then had a 
good view of it, and took its portrait; it remained motionless for 
along time. The colour was then of a clear pale whitish green ; 
at each segmental division the skin is loosely wrinkled, each fold 
or wrinkle being pale yellowish white, especially noticeable 
between the first six or seven segments; the remainder are 
fairly uniform in colour; each segment is delicately wrinkled 
transversely, in addition to the divisional folds mentioned. In 
this moult a great and important change takes place, 7. e., in the 
colouring of the head, and the disappearance of the ovate black 
blotch on the last segment, which is so conspicuous in the former 
stage, and the black warts and collar on first segment. 
The head is now entirely of a pale whitish green, with a faint 
bluish tinge, excepting an extremely fine central black line 
separating the lobes of the crown, and there are about six tiny 
black warts in the region of the eye; four are in the form of a 
crescent, the two lowest are the most conspicuous and bead-like ; 
on each segment are a few exceedingly small black specks, only 
just visible by the aid of a strong lens; the most distinct are 
those forming a double longitudinal dorsal series, two in the 
middle of each segment ; these appear concaved and very metallic, 
reflecting a high light; the markings appear precisely similar to 
those in the previous stage; the legs, claspers, and under surface 
are uniformly pale green in colour; below the spiracles the body 
Mie 
