193 



and forms intermediate between it and bakeri 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, bakeri, budapestinensis, 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. 



