478 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
legs were seen and, with some question, traces of a ninth pair behind 
these. These young east their skins at least once each as a small 
cast was found on May 28th and another June 5th. The animals, 
both young and adults, died during the summer. 
In 1903, taught by the experience of the previous year, only enough 
earth was provided to shelter the animals so that a more satisfactory 
view could be obtained with the microscope. A number of individuals 
were brought in at different times from April 10th to April 23d. About 
ten survived. 
On May 12th, a number of white bodies slightly less than 0.5 mm. 
in diameter were found lying on the surface of the earth in the Petri 
dish. There were five of the bodies and their surfaces were not smooth 
but as if covered with an irregular network. On gently moving the 
earth these bodies were found to be fastened to the earth particles 
by fine fibers. These fibers (Seutigerella web) were likely attached 
to the surface network of the problematic bodies but this was not 
certainly to be determined. The bodies were of a glistening pearly 
white when first seen but the next day the elevated network showed 
a pinkish tinge. One of the bodies showed a shallow depression on 
its surface also but this was probably not a normal phenomenon but 
an evidence of shrinkage, because by May 19th, seven days after the 
bodies were first seen, they were dry and shrunken. 
In 1904, other individuals were brought in from April 18th to May 
5th. The earth in the Petri dishes was kept very moist and several 
glass slides were provided for the Seutigerellas to rest beneath. As 
the most usual place to find them in their habitat is on the lower sur¬ 
face of stones or leaves, they take very kindly to the lower surface of 
glass which rests on the earth in which they are. Whenever water 
was added to the dishes to moisten the soil, air bubbles of some size 
were formed beneath the glass slides. On May 9th an individual 
was seen in an air bubble entirely isolated from its companions. It 
was freed artificially May 11th and seemed in all ways lively and 
healthy. Another 3 mm. in length which was found in an air space 
on May 10th remained in that space until freed on May 21st. On 
the next day the same animal went into a new air space 10 mm. in 
diameter and there on May 25th was found to have laid 8 eggs (text 
fig. C). These were smaller than the glistening bodies of the pre¬ 
ceding year but otherwise were not different. The mother stayed for 
13 days in the air space with the eggs, moving about slowly from time 
