395 
Tue Fauna oF a Souution Ponp. 
By WILL Scort. 
PAGE 
PEGE OCLC LT OMS 2 oy sh Os See eal Oe ae A nt tees No OE gies nt Ns eA co Cae 395 
The Pond— 
TOR 3053 1 BNO 21! Seep Ace Ree gE See EASA ME xt Re DoT Ree ole vie Re pM a eee 396 
LEN Die C121 (0 1 gaa SRP gee IR SUCCINCT SRO 396 
BIST UC GION 4 y.2 rs ater Se Ses EO OP hi Be REPOS cee See Ga 401 
IEE VEC ae Ao, ed RO a AN ache A on © eg. 402 
TEVA EAS es ecko tgs ERE CE ERE CREE aA oes tere ba 405 
Ea GON Gs Geer pete as Moe as ear e ee eiaiiee sete nee G oe ee ee 419 
Ecological Relations— 
(a) of the fauna to similar habitats (migration).................... 420 
(b) of the fauna to this habitat 
IONE ee cuatons ais piosake a eho eean e oaet ERO Re FH Orie BES OE AE 424 
MEMES LAGULE TN ISS cin icky hart eri oioes sete Tete een 427 
PS Re fer pO Oi od dc Sosa eis avaititie SLM Ree ea ee 432 
(c) of the species to each other- 
Hooda elabionsiiesra vain enon ese ns See eee 432 
Relanionkbonlgakesrandehurvensiens aA scar sci. oclos. 23 sem ae oe ak Sosa Seeker 437 
EeeithOnh LO; Cavere Am hOMeen:. cle. asa sv silesioesaee sccm emeetoe ee 439 
Wnsolvedeb rol lenis ames rye tke dere a sscree cae esc, oa, Saale Es See TA EEN 440 
[SIS) Fv ay ta itr 0] Sa ge ergy See ee Mr A AL RS Sa, 9 ne a AN 440 
INTRODUCTION. 
In 1909 I gave an account of the plankton of the subterranean stream 
in the caves of Indiana University’s cave farm. Among other things it was 
found that the plankton is composed of epigean forms and is derived from 
ponds in such sink-holes as have an opening above their lowest points. A 
study of the fauna of the ponds furnishing the cave plankton became 
desirable. 
1Contribution from the Zoélogical Laboratory of Indiana University No. 119. 
