580 



INDEX. 



Pandorina — Continued. 



as food of rotifers, 312. 



polarity and direction of rotation 

 of, 284, 431, 432. 



disease of, 289. 



morum, 273, 327, 435- 437- 

 direction of rotation of, 284. 

 parasite of, 434. 

 papillifera var. carinata, Clepsine, 

 498. 



var. lineata, Clepsine. 493. 

 Paracyclops, 59, 65. 

 Paramceciidas, 332. 

 Paramascium, 332. 



aurelia, 307, 313, 332. 

 Parasite of Eudorina elegans, 435. 



of fishes, 504. 



of Hydra, 337. 



of Pandorina morum, 434. 



of Platydorina caudata, 425, 434. 

 Parasites of Asplanchna herrickii, 



365- 



of the Unionida?, A Statistical 

 Study of the, 399-418; 

 summary of results 

 reached, 417. 



comparison of infestation 

 by different, 412. 



comparison of local in- 

 festation by, 416. 



degree of infestation of in- 

 dividual hosts by, 410, 

 411, 415. 



geographical distribution 

 of, 4"4- 



relation of local conditions 

 to number of, and to 

 character of infestation, 



417. 

 situation of, and manner 



of infestation, 404-407. 

 specific distribution of, 409. 

 effect of seasonal 



changes on, 414. 

 parasitica, Hirudo, 480. 



parasitica — Continued. 



Placobdella, 480, 487, 488, 491, 



492, 5°3- 

 parcus, Cyclops, 38, 41, 42. 

 parvus, Lampsilis, 401, 403, 404, 409, 

 410, 412, 413. 



Unio, 337, 403. 

 patelliformis, Lecanium, 393. 

 Patten, Wm.,on dist ribu tionof 



Heterocope, 225. 

 patina, Pterodina, 353, 378. 

 Peck, J. I., The Sources of Marine 



Food, cited, 13. 21. 

 pectinata,Synchasta,352,354,355,366. 

 pectorale, Gonium, 437. 

 Pedalion, 346, 355, 383. 



mirum, 355, 384. 

 seasonal distribution of, 383. 

 Pedalionidae, 359, 383. 

 Pedetes, 368. 



saltator, 368. 

 Pediastrum, 421. 



as food of rotifers, 351, 365. 

 pediculis, Trichodina, 337. 

 Pelomyxa, 317. 



villosa, 317. 

 Peloscolex, 456. 



variegatus, 456. 

 pentagonus, Cyclops, 57. 

 perarmatus, Cyclops, 59, 60. 

 Pergande, Theo., descriptions of 



Coccida; by, cited, 390. 

 Perichaeta, 441. 

 Peridinidae, 329, 421. 

 Peridinium, 307, 329. 



tabulatum, 313, 329, 421. 

 Peritricha, 308, 309, 316, 337. 

 perniciosus ? eucalypti, Aspidiotus, 



39°. 

 Pfeffer, W., Loc omo tor is che 



Richtungsbewegungen durch 

 chemische Reize, cited, 283. 

 on locomotion of Gonium, 283. 

 Phacus, 274, 326. 



longicauda, 313, 326. 



