19S 








and forms intermediate between it and bakert 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, baker1, budapestinensts, 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. 














Me Pos, PEA Oa are wiaea cet | Mars 24 41° PPX) Apr. 17 66° 8,398 
obec OERER ICRC ERTL Peg tes uel ese Apr. 27 60° 6,400 
2 Ot IOC O RTE RENEE etre ates, |p Mare 22 Sits 2,000 Apr. 26 Sis 6,400 
Temp. No. | Date Temp. No. | Date | Temp. | No. 



=| ip eee —= —— | Aug. 15 84° 181,764 

June 19 80° 324,254 
sz ——— ==} Tittise BE) Gfoe 10.0008) .—<—<$—= pes? 






















Temp. No. Date Temp. | No. | Date |Temp. | No. 
Sept. 5 74° 28h |) —————— =— — | Dec. 4 Ay 345 
= ee = | Dec., 3 ae 794 
Sept. 21 ihe 1205200" | Oct. 5 ike 800 | 
Sept. 6 | 79° 5,600 | ———_ | ——| ———| Dec. 13 | 33° 500 





