193 
and forms intermediate between it and bakerz were not recorded. 
This is, I believe, the first record of its occurrence in American waters. 
Brachionus urceolaris Ehrbg.—Average number of individuals 
including all varieties, 468; of eggs, 56. The species was relatively 
quite abundant in 1897 (5,290 and 1,976) in the stable conditions 
then prevailing, but less so in the recurrent floods of 1896 (1,020 
and 494). It is not a common species, being outranked by B. 
angularis, bakert, budapestinensits, and pala. The species as a 
whole is found throughout the entire year, though never in large 
numbers since 1895. The following table, which gives the principal 
pulses in the several years, shows the wide range of the species and 
its varieties in seasonal distribution. 
PuLses OF BRACHIONUS URCEOLARIS. 
Year Date Temp. No. Date Temp. No. 
NS OAM Ta aca Petes area ssaet ss spn teietsh ania seve, ays is ——— = =—S= | = —S | == 
wb Oren aah testo ren ens ial sis) Ae Sil tiacnees —— = 
HIS O Olean gictelcveye ehh citicl aia Mavevarlie'eya « ares ens Mar. 24 41° 2,020 | “Apr. 1% 66° 8,398 
USO oe Oe lok SHOR Cae OT RCE Re eer Apr. 27 60° 6,400 
Seek e we Ga DIOW CHO Ea te ae CRC eee Mar. 22 silt 2,000 Apr. 26 Sie. 6,400 
Year Date Temp. No. Date Temp. | No. Date Temp. | No. 
S | | 
1894 Aug. 15 84° | 181,764 
1895 June 19 80° S24 Se | 
1896 a — Ss | Ice DS go° 10,000 
1897 
1898 ——— — ———_ | ———— —- 
Year Date Temp. No. Date Temp. No. Date Temp. No. 
1894 —— 
1895 Sept. 5 74° 4,293 Dec. 4 32° 345 
1896 —= Dec as Soe 794 
1897 Sept. 21 I 121,200 Oct. 5 7fal> 800 SS == SS = 
1898 Sept. 6 79° 5,600 Dec. 13 33° 500 
