588 



PROTOZOOLOGY 

 b 



Fig. 266. a, Halteria grandinella, X490 (Kahl); b, H. g. var. cirrifera, 

 X370 (Kahl); c, H. g. var. chlorelligera, X260 (Kahl); d, Strombidiuin 

 calkinsi, X900 (Calkins); e, Tontonia gracillvma, X540 (Faur^- 

 Fremiet); f, Slrohilidium gyrans, X340 (Kahl); g, Tintinnidmm 

 fluviatile, Xl40 (Kent); h, i, T. semiciliatum, Xl40 (Sterki); j, Strom- 

 hidinopsis gyrans, X270 (Kent); k, Tintinnopsis cijlindrata, X440 

 (Daday); 1, T. illinoisensis, X420 (Hempel); m, Codonella cratera, 

 X540 (Faure-Fremiet). 



S. calkinsi Faure-Fremiet (Fig. 266, d). 35-60/1 long; brackish 

 and salt water, Calkins (1902) first observed it at Woods Hole. 



Genus Tontonia Faure-Fremiet. With well-developed apical 

 collar; a long cytoplasmic (contractile) caudal process; salt water. 



T. gracillirna F.-F. (Fig. 266, e). 48-52ju long; caudal process 

 250-300/x long; macro nucleus moniliform; with zoochlorellae. 



