WILLIAMS: HABITS OF SCUTIGERELLA. 
477 
This is difficult to reproduce satisfactorily. The best results obtained 
are shown in text figure B which is drawn from a photograph. 
Scutigerella when jarred or when chilled takes a very characteristic 
attitude. It contracts one side of the body till its shape is that of a 
crescent and is quiet. Then if further disturbed by taking up the stone 
or leaf on which it is, it may loosen its foothold and roll or drop to the 
ground and thus usually escapes. If no opportunity is given for drop¬ 
ping it will straighten itself and busily search with its antennae for 
some crevice in which to hide. 
Eggs and Larvae. 
Nothing definite concerning the embryology of this form had been 
reported until a note in Science by Williams (’06, p. 527) entitled 
“The young of Scutigerella.” Latzel (’84) described a Scutigerella 
nivea 1.13 mm. long with 6-jointed antennae, ten dorsal scutes, six 
pairs of well developed legs, and a seventh pair budding. Packard 
(’98, p. 24) after stating that Henshaw reports finding a hexapodous 
young one (said to be Scolopendrella latipes Scudder), says that it is 
most probable that the young is hexapodous since the first pair of 
limbs is 4-jointed, all the rest 5-jointed. 
On April 15, 1902, six or eight Scutigerellas were taken beneath 
flat stones in the bed of a small rivulet flowing through a piece of wood¬ 
land. These were placed in a Petri dish with earth which was kept 
moist. By May 20th, they were reduced to four individuals and these 
had spun their webs around on the surface of the earth in the dish. 
By this time at least three of the animals had shed their cuticular cover- 
ings. One of these skins was cast May 1st, one May 3d, and the 
third May 20th. The time of this casting is significant for the egg 
laying. 
On May 23d, while inspecting the dish with a hand lens two very 
minute individuals, each of which seemed to have but six pairs of 
legs, were seen in the part of the dish where the earth was deepest. 
On account of the amount of earth it was impossible at first to deter¬ 
mine with certainty the number of pairs of legs. On May 27th when 
the animals were seen under more favorable conditions and with a 
compound microscope, each young animal showed conclusively that 
it had seven pairs of legs. On June 3d buds for the eighth pair of 
