INDEX. 



579 



( Hiogochaeta — Continued. 



Notes on Species of North Amer- 

 ican. IV. On a New Lumbri- 

 culid Genus from Florida, with 

 Additional Notes on the Ne- 

 phridial and Circulatory Sys- 

 tems of Mesoporodrilus asym- 

 metricus Smith, 459-478. 

 explanation of plates in above 



article on, 477. 

 literature cited in above article 

 on, 476. 

 Oligochaete parasite of Unionidae, 

 407. 

 aquatic, as food of Erpobdella 

 punctata, 535. 

 Oligochaetes, aquatic, as food of 



Htemopis marmoratis, 527. 

 Oligotricha, 308, 316, 335. 

 Opercularia, 311, 312, 340. 

 articulata, 340. 

 food of, 31 1. 

 irritabilis, 342. 



occurrence of, on various ani- 

 mals, 340. 

 food of, 340. 

 nutans found on a Planorbis, 340. 

 rugosa, 340. 

 Opuntiaspis proposed as new sub- 

 genus for Mytilaspis philococcus, 



397- 

 oregonensis, Diaptomus, 109, 119, 



124, 151, 170, 171, 183, 229, 265. 

 ornata, Floscularia, 352,360. 



Nassula, 332. 



var. rugosa, Clepsine, 487. 

 Orthocyclops, 29, 51,64. 

 Ortonia preoccupied ; replaced by 



Protortonia, 390. 

 Osborn. H. L., ondistomid parasite 



of Anodonta plana (=grandis) 



and Strophitus edentulus, 406. 

 Oscillaria, 19, 419. 

 Osphranticum,97, 104-225, 226, 220, 



237- 



Osphranticum — Continued. 



Diaptomus, and Cyclops, relative 



hardihood of, 100. 

 Diaptomus, Epischura, and Lim- 

 nocalanus, discussion of 

 structural similarities 

 and differences indica- 

 tive of the relationships 

 of the genera, 226-228. 

 general bibliography of 

 genera of, 185 ; additions 

 to, 268. 

 synopsis of the relation- 

 ships of the genera, 102 

 105. 

 eggs of, 228. 

 labronectum, 227, 230-235. 



distribution, color, and varia- 

 tions of, 234. 

 on movements of, 235. 

 Limnocalanus, and Epischura, 

 The North American Cen- 

 tropagidae belonging to the 

 genera, 225-270. 

 on localities preferred by, 226, 



234- 

 ostreaeformis, Aspidiotus, 398. 

 ovata, Cryptomonas, 313, 328. 

 Overton, E., Beitrag zur Kenntniss 

 des Gonium pectorale, cited, 287. 

 oxysternum, Metopidia, 377. 

 Oxytrichidae, 336. 

 oxyuris, Euglena, 313, 324. 



pala, Brachionus, 353-354. 355. 378- 

 pallida, Raphidiophrys, 313,322. 

 pallidus, Diaptomus, 100, 108, 121, 

 124. 137, 144. 183. 265. 



var. sicilis, Diaptomus, 122. 

 palustris, Fremnodrilus, 450. 468, 



469, 472, 473. 474. 475- 

 Pandorina, 275. 276, 278, 280,284, 



286, 287, 327, 419, 420, 423. 425. 



433. 43 6 .437- 



