334 
TABLE I—continued. 
ORGANISMS PER CuBIC METER IN PLANKTON OF ILLINOIS RIVER IN 1898. 
(An asterisk at head of column indicates that all entries in it are based on 
filter-paper collections.) 
Pa 
is} H 
S aS 3 Polyartha platyptera 
Ss aS: = ie Sie SS Male eggs 
1898 38 83 = a? Sas SS 
SS Q8 gs su | Sss SES 
BS Ss S32 NS Sis as 
S c | Ss S Ss ss S Bs e Ey Free Carried 
Gansu eae (0) 0 0 0 0 1,000 0 0) 
re tae 2 lesion ween 0 0 10) 100 (0) 1,200 0 (0) 
SEF SD Siena cones 0) 0 (0) (0) 0) 11,997 (0) 0 
Bebie 8Sint aes 0) 0 0 0 24 3,200 0 0 
= Bin eine 0 | 0 0 0 240 2,000 0 0 
Se SIS es oO, 0 0 0 80 1,600 | 0 0 
Oe a Dies, eee 0 | 0 10) 0 0 6,318 (0) 0 
Mia sue la- cn east 400 0 0 0 800 3,200 0 0 
. Braco 0] 0 0 0 1,200 5,200 0 (6) 
See Moy ac (0) 0 (0) 0) 6,400 22,200 0 0) 
DID ire eats 07 400 (0) 0; 10,800 37,600 0 1,600 
Die AS) eames 0 0 0) (0) 200 40,400 0 2,600 
Anns mSicet. can 10) (0) 100 0 300 42,800 1,300 2,800 
Se BNL aN 0 100 100 0 0 26,700 900 1,900 
Ht). pee 0, 400 400 0 0 148,200 8,800 1,600 
mae 2 Olen oer: 0) (0) 0 (0) (0) 696 , 000 150,400 53,800 
WERT Boos nec 0 | 0 0 0) (0) 582,400 0 19,200 
robs all) 98 x Pea 0 10) 0 0 0 137 ,600 4,800 10) 
Seb lidinneestts 0 800 0 0 0 195,200 12,000 2,400 
rob) DAT eas 0 0 200 800 0 52,200 0) 0 
Hoe PBiNrs a Boat 0 (0) 200 400 0 52,400 200 (0) 
PUNE) G7 50s. ceyete 0 (0) 0) 0 0 304,000 1,600 0 
ee LATA AEB ,, 10) 0 10) 10) 0 432,800 (0) 0 
eg WD illia cee te, 19,200 800 0 10) 10) 241,600 0 (0) 
SO DB tao 11,200 300 0) 0 0 56,800 0 0 
Hck Datapar 2,000 0) 0 0 0 6,400 0 ) 
Lal OR ee 1,600 0 0 (0) 0 21,600 0) 0 
SSegtiel Oi dan taut: 7,200 0 800 0 0 89,200 0 0 
SEEK vores abe 4,000 0 800 0 0 86,400 (0) 0 
WINE Nae a AR 15,200 0 0) 0 0 288 ,000 0 (0) 
4 OA ote 4,000 (0) (0) 0 6) 55,200 10) (0) 
poe SUOR cn, ate 5,600 0 0) 0 0 84,800 10) 0 
SOE Oratter tate 5,600 0 10) 0 0 96 ,000 0 0 
yO OR aaa eke 800 0 0 (0) 0 51,200 (0) 0 
Sep tatObicr. cra: 0 (0) 0 0) (0) 4,000 0) (0) 
SOMALI S Ta ete 2,500 (0) (0) 0 0 31,000 0 0 
St Oe oy 1,500 0 0 500 0 72,500 0 0 
Ait Lice 4,800 0 0 0 10) 238 , 400 0 1,600 
Oct Bid ahi cee 1,000 0 0 0 0 24,500 0 0 
pap aS Hiaiasce (0) (0) 0 0 (0) 47,500 5,000 500 
fet) Ul Biiver cithe 0) 0 0 (0) 0 27,000 2,000 1,500 
Te Reo 0 0 (0) 0 0 37,500 0) 2,000 
Wenig he ame oe 60 0 0 0 0 500 0 0 
s Gis cee 0 0 10) 0 0 1,000 0 0 
cy) SLIGO aaa 0) (0) 0 0 0 2,000 0 0 
uP Noha eta 400 (0) 0 0 0 6,000 | (0) 0 
RY AS eet ie 0 0 0 (0) 0 1,000 0 (@) 
Dec Oise. foe 0 0 10) 0 0 6,020 0 160 
ar AOL ee 0} 0 0) 0 (0) 42,100 | 100 100 
ple?) Oe eaet Neg 0) 200 (0) 0 40 63,400 10) 200 
oD Dik tots Res 0 | (0) 0 0 (0) 19,200 0 0 
| | | 
Average...... 1,674 67 | 50 | 37 388 | 86,674 3,598 | 1,768 
