INDEX. 



583 



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

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

 californica, 273, 274, 276, 279, 280, 

 281, 313, 328, 421, 437. 

 locomotion and polarity of, 283. 

 relationship of, 286. 

 synoptic characters of, 290. 

 illinoisensis, 424, 432, 437. 



a New Species from the Plank- 

 tun of the Illinois River. 

 Plankton Studies. II., 273- 



293- 

 bibliography in Kofoid's ar- 

 ticle on, 291-292. 

 description of, 274-281. 

 disease of, 289. 

 distribution of, 273. 

 explanation of plates in Ko- 

 foid's article on, 293. 

 hvpothetically considered as 

 stage in life cycle of Eudori- 

 na, 286. 

 locomotion of, 281-285, 43'- 

 reproduction of, 287-289. 

 synoptic characters of, 290. 

 synoptic characters of, 290. 

 Pleurotrichinae, 336. 

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

 . 410,412,413,316. 

 plicatilis, Epistylis, 339, 342. 

 plicatus, Embolocephalus, 456. 



Unio, 403 

 Ploesoma, 357, 368. 

 lenticulare, 368. 

 lynceus, 354, 368. 

 seasonal distribution of, 352. 

 Ploima, 356, 357, 364, 421. 

 pluvialis, Stephanosphaera, 437. 

 pocillum, Dinocharis, 352, 372 

 Podoplea, 105. 



polipinum, Carchesium, 338. 

 Polyarthra, 274, 346, 366, 421. 

 aptera, 367. 



platyptera, 354, 355, 3 6 7- 

 euryptera, 367. 



Polyarthra platyptera — Continued. 

 Rhabdostyla found on, 340, 



367. 

 seasonal distribution of, 352. 

 polymorphus, Bucephalus, 407. 



Stentor, 313, 334. 

 Pond snails, examination of, for 



Protozoa, 310. 

 Pontellidae, 102. 



Poppe, S. A., 29, 98, 99, 177, 178, 

 229, 234, 248. 

 description of Limnocalanus 



sinensis cited, 237. 

 on differences between Lim- 

 nocalanus sinensis and L. 

 macrurus, 249. 

 porcellus, Ccelopus, 372. 

 Potamogeton, 349. 



Limnias ceratophylli found on, 

 360. 

 Potamoichetor, 229, 230. 

 Potomoichetor, 229. 

 fucosus, 230, 233. 

 prasinus, Cyclops, 57,63, 65. 

 Premnodrilus, 471. 

 palustris, 469. 



description of, 459 468. 

 Eclipidrilus frigidus, and Mes- 

 oporodrilus as y m metricus 

 compared, 472-475. 

 priodonta, Asplanchna, 351, 354, 



364, 365. 

 Pristina flagellum, 443. 



leidyi, 443- 

 Proceedings of the Philadelphia 



Academy of Sciences, 542. 

 profuga, Allolobophora, 441. 

 proteus, Amceba, 317. 

 Protortonia superseded by * Mtonia, 



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. 



