Tlir CcMitral Nerxous System and Siini)Ie 
Ixeac'tioiis of a Hare VVliip S(H)r[)i()n 
W II I I AM A. nil lil\ 
A nuinlH'i- (il spi'cimL'ns ot rrillnmis pi'iihiprllis Cook were col- 
lected In tlu- w litei- In the colleije park at Claremoiit. The only 
other recorti ol any member of this family found in the United 
States is tlie early paper of Cook which tlescrihes this species from 
Palm Sprinijs, California. At another time there will be published 
a description witii lijj;ures of the o;eneral extcinal anatomy of this 
interesting ci-eature. I"io;. 1 is partly from an (uitline drawing by 
Miss Margaret Nfoles. I'he general position ol tiie nerxous system 
is sho\\'n in the outline. So far as we could ilctei-mine there were 
no sense organs but hairs. These toi- the most part were ot the 
usual arthropotl type, but there were se\ eral modilieations of them 
as will be shown by Miss Moles at a later time. The hairs are 
most abundant under the body and are probably important organs 
for giving sensations from the surfaces where the animals run. The 
most remarkable hair sense organs arc on the legs. The figure 
shows the position ol these sleiuler delicate structures, two on the 
lirst leg, one on the others. If an animal is approached by any object 
one of these hairs is apt to be touched, especially if attempts are 
made to sei/c the animal. .\t first it was almost impossible to be- 
lie\e that the little creatures did not have eyes, they so well avoided 
all attempts to capture them with forceps. When approached by 
some object which probably touches one of the long hairs they run 
either backwards or forwards apparently with great accuracy de- 
termining the position of the approaching object. However their 
backward running is nmst marked and most remarkable. They run 
with gi'cat swiftness m a backwaril (.lirection in some cases for se\'- 
eral inches. I found little e\ idence of other sense organs than those 
of touch, riiey did not espccialK a\ oid strong oclors, but after a 
rather long exposure to strong light or heat they sought refuge under 
some object. 
Although the chitin is thin in places the first attempts at serial 
sections through the whole body were not very successful. It was 
