454 Transactions of the Society. 



Order SCIRTOPODA, 

 Family Pedalionid^. 



Pedalion oxyure Sernow {6Jf), 



Valparaiso, Chile ; pond in the Zoo, Buenos Ayres, Argentina ; 

 salt lagoon at Eio, Brazil. 



This is believed to be a brackish-water form. In Eio it cer- 

 tainly was in very saline water. I cannot tell if the waters in 

 Chile and Argentina were salt. They were too dirty to induce me 

 to taste them. In Buenos Ayres the Pedalion was in company 

 vTith other supposed brackish-water forms, Brachionus mulleri and 

 a very large twisted diatom, which was also abundant in the 

 lagoon at Eio. 



I have found the species also in the Scilly Isles in brackish- 

 water. 



In all those localities I have observed that the characteristic 

 cusp at the end of the body is extremely variable in length, and 

 may be wholly absent. 



Bibliography. 



(The numbers continue those in the two earlier parts of this paper.) 



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