583 



Pleodorina, 273, 277,286,327,419,420, 

 424, 425. 427, 432, 433, 434, 437. 

 califoniica, 273. 274, 276, 279, 280, 

 281, 313, 328, 421, 437. 

 locomotion and polarity of, 2(83. 

 relationship of, 286. 

 synoptic cliaracters of, 2qo. 

 illinoisensis, 424, 432, 437. 



a New Species from the Plank- 

 ton of the Illinois Rive r. 

 Plankton Studies. II.. 273- 



biblit)graphy in Kofoid's ar- 

 ticle on, 2QI-2Q2. 



description of, 274-281. 

 disease of, 289. 

 distribution of, 273. 

 explanation of plates in Ko- 

 foid's article on, 293. 

 hypothetically considered a s 

 stage in life cycle of Eudori- 

 na, 286. 

 locomotion of, 281-285. 43'- 

 reproduction of, 287-289. 

 syno])tic cliaracters of. 290. 

 synoptic characters of, 2go. 

 Pleurotrichinae, 336. 

 plicata, Quadrula, 401,403, 408, 409, 



410,412, 413, 316. 

 plicatilis, Ejiistylis, 339, 342. 

 ))licatus, Kmbolocephalus, 456. 



Unio, 403 

 Pkesoma, 357, 368. 

 lenticulare, 368. 

 lynceus, 354, 368. 

 seasonal distribution of, 332. 

 Ploima, 356, 357, 364, 421. 

 pluvialis, Stephanospha?ra, 437. 

 pocillum, Dinocharis. 332. 372 

 Podoplea, 105. 



polipinum, Carchesium, 338. 

 Polyarthra, 274, 346, 366, 421. 

 aptera, 367. 



platyptera, 334, 355, 367. 

 euryptera, 367. 



Pol y<i rt h ra pla ty ptera — Continued. 

 k h a b d o s t V 1 a found on, ^40, 



367. 

 seasonal distribution of, 332. 

 ]M)lym()rphus, Bucephalus, 407. 



Stentor, 313, 334. 

 Pond snails, examination of, fur 



Protozoa, 310. 

 Pontellidas, 102. 



Poppe, S. 'A., 2q, 98, 90, 177, 178, 

 229, 234, 248. 

 descrijjtion of Linniocalanus 



sinensis cited, 237. 

 on differences between Lim- 

 nocalanus sinensis anfi L. 

 macrurus, 249. 

 porcellus. Cerlopus, 372. 

 Potamogeton, 349. 



Limnias cerato])liylli f(jund on, 

 360. 

 Potamoichetor, 229, 230. 

 Potomoichetor, 229. 

 fucosus, 230, 233. 

 ])rasinus, Cyclops, 57, 63, 65. 

 Premnodrilus, 471. 

 palustris. 469. 

 description of, 459- 468. 

 Eclipidrilus frigidus, and Mes- 

 oporodrilus a s y m metricus 

 compared, 472-473. 

 priodonta, Asplanchna, 351, 334, 



364. 365- 

 Pristina flagellum, 443. 



leidyi, 443. 

 Proceedings of the Philadeliihia 



Academy of Sciences, 542. 

 profuga. Allolobophora, 441. 

 proteus. Amoeba, 317. 

 Protortonia superseded liy Ortonia, 



390. 



Protozoa, 14. 304 342.348,351.421. 



and Rotifera found in the Illinois 



River and Adjacent Lakes 



at Havana, 111., A List of, 



301-388. 



