359 
TABLE I—conitinued. 
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.) 








D Polyarthra < % 
platyptera 8 = . SS 8 2 ws 
J Q Ss 
1898 Winter eggs cs &q aS 8 3 Ss 3 = S38 & aS 
She 3.5 23 Ss RSS Sas =e 8 
28 8 £8 | 8s | 88 | $8 SS s.45 
Free |Carried © QO & & es ee a of & ey 
Jigna, als Geen 0 0 2,200 0 0 0 0 2,120 100 
oe 74 ee eee 100 0 1,000 0 100 0 0 300 0 
Boe 82S ie sr scsrs =a) 0 8,127 0 0 (0) 0 4,257 0 
IAS SInoacod 0 0 1,700 0 0 0 72 1,000 0 
of Sign at 0 0 2,800 0 0 0 0 1,200 0 
Oe a Oeeoeereee 800 0 3,200 0 400 0 0 800 1,200 
St ILD aires conus 0 0 6,318 0 0 0 632 0 0 
Wik, ala omens 0 0 3,200 0 0 0 0 6,400 0 
of Se saree 0 0 4,000 0 0 0 0 4,800 0 
STS he 200 0 17/800 0 40 0 0 15/200 160 
IE ay ERG 0 0 26,400 0 400 (0) 0 58,000 0 
pet DOS costes 200 0 11,400 0 100 0 0 47,000 0 
joie eS Seco ee 100 100 10,400 0 300 0 0 21,000 0 
Bee LD sya sv ails 0 100 8,700 0 200 0 0 11,500 0 
iy ie ree cece 1,600 0 104,200 0 0 0 400 368 ,000 0 
pm e OR och «(ee 22,400 0 502 ,400 0 0 0 1,600 954,400 6,400 
Wanye Ore slays .< 51,200 0 316,800 0 0 0 0 1,139,000 9,600 
eel COS Eanes 11,200 0 72 ,000- 0| 3,200 0 0 233,600 6,400 
me LN Fes) sere cepis 2,400 0 120,000 0 0 0 800 206 , 400 800 
LE: cos lisa 400 0 28,800 200 0 0 200 60,480 0 
eer venena a 400 0 10,600 40 200 0 600 61,600 0 
Wise! Toe. eas 0 0 96,000 | 1,600 0 0} 3,200 48 ,000 0 
hes | Ce eee 800 0 119,200 0 0 0 800 19 ,200 800 
See i eee 800 0 154,400 0 0 0 | 112,000 795,200 3,200 
2B ceva ie 800 0 16,000 100 0 0 22 ,400 0 
icihy > -Syorap ons 400 0 7,200 0 40 0 800 22,800 400 
| Seo Sinise sts 183 400 0 13,600 0 400 0 400 9,600 800 
. vee a2 eee 800 0 24,000 0 0 0; 20,800 64,800 0 
Oo Oana 0 0 53,600 0 0 0 400 8,000 0 
ATI 2 eeu 31 0 0 295,200 0 800 800|} 12,000 170,400 0 
me Qe iers cus 800 0 84,800 0 400 0 4,800 52,000 800 
- ES MO var) -3::5; 0 0 108 ,000 0 800 0 1,600 18,400 60 
Ce Ss ees 0 0 63,200 0 800 0 3,200 24,800 0 
. GeO nea ercees 800 0) 47,200 0} 1,600 800 800 1,600 0 
. Sept. 66.00: 0 0 8,800 0 0} 800 0 a) 0 
pe tl Siewets. ces 1,000 0 20,000 0 0 0 1,000 14,000 500 
een ED. Olivas sa sc3 1,000 0 | 103,000 | 0 0 0 4,500 27,000 500 
C1 i ai 1/600 1,600 86,400 0 0 0| 30,400 265,600 100 
Oecta aie aie a: 1,000 0 15,000 0} 1,000 0 500 5,000 0 
Co a een 0 0 5,500 0 0 0 0 27,000 0 
Coa (Saas 0 0 14,000 0 0 0 500 77,000 0 
Be 2 Deere. ok. 0 0 17 ,000 0 0 0 0 824,500 0 
I fopies, saleiaespeats 500 0 4,500 0 0 0 0 110,500 0 
oe Bia tenes 1,000 0 2,000 0 0 0 0 97,000 60 
Maa MO cotrs Paci 1,000 0 2,000 0 0 0 0 110,000 0 
oR ier erent 0 0 6,000 0 0 0 0 38,000 0 
Gy 1 et ae 0 0 3,000 0 0 0 500 39,000 0 
WD eCiy BGisne ice 0 0 9,160 0 0 0 20 42,500 0 
SOIR 2 terete 0 0 29300 0 0 0) 2,500 55.720 0 
See 2 Olemers tie 0 0 52,000 0 0 0 0 59 ,200 0 
ee DUN fare yeereicaske 0 0 11,000 0 0 0 400 17,640 0 
IAVEKAge ne ae ne 1,994 | 34 52,560 | si7/ 207 | 46 3,950 120,391 611 








