INDEX. 



5 8l 



Phacus — Continued. 



pyrum, 313, 326. 



triquetur, 326. 

 phaleratus, Cyclops, 29, 30, 59, 63,65. 

 Phaulomytilus as new g enu s for 



certain species of M y t i 1 a s p i s, 



397- 

 Phenacaspis as new genus for cer- 

 tain species of Chionaspis, 398. 

 Philadelphia Academy of Sciences, 



418. 

 philadelphica, Astacobdella, 542. 

 philadelphicus, Bdellodrilus, 542. 

 Phillips, C. E., 98. 

 Philobdella, 509, 510, 511. 

 floridana, 51 1. 



lumbricoid worm eaten by, 518. 

 gracile, 511-518. 



alimentary canal, color, and 



habits of, 518. 

 annuli and somites of, 515. 

 diagnosis of, 511. 

 food of, 518. 



general description and meas- 

 urements of, 512-515. 

 reproductive organs of, 517. 

 philococcus, Mytilaspis, 397. 

 Philodina, 363, 421. 

 macrostyla, 363. 

 megalotrocha, 363. 

 roseola, type of trophi of, 345. 

 seasonal distribution of, 352. 

 tuberculata, 363. 

 Philodinidas, 357, 359, 362. 

 Phreoryctes emissarius, 442. 

 Phreoryctidae, 442. 



found in Illinois, 442. 

 Physa, Epistylis plicatilis found on 



shells of, 339. 

 Pickering, C, generic description 



of Scopiphora vagans, 263. 

 Picronitic acid, formula for, 340. 

 pilosus, Vermiculus, 446, 450, 452. 

 Pilsbry, H. A., 418. 

 piricola, Diaspis, 398. 



Piscicola parasitic on small fish, 



504. 

 Piscicolaria, 504. 

 piscina;, Diaptomus, 98, 109, 116, 



118, 125, 181, 182. 

 Placobdella, 480, 496. 



parasitica, 480-486, 487, 488, 491, 

 492, 503. 

 alimentary canal and color of, 



485. 

 annuli and somites of, 482-484. 

 compared with P. rugosa, 



482. 

 diagnosis of, 480. 

 general description of, 400 



482. 



habits of, 486. 



reproductive organs of, 484. 

 rugosa, 481, 482, 484, 487-492. 

 alimentary canal, color, and 

 reproductive organs of, 49 1. 

 annuli and somites of, 488-491. 

 diagnosis and general descrip- 

 tion of, 487. 

 habits of, 492. 

 Plagiola, capacity for infestation 

 exhibited by, 414. 

 donaciformis, 401, 403. 



parasites 0^409,410,412,416. 

 elegans, 401, 403. 



parasites of, 405, 406, 400, 410, 

 412, 413, 416. 

 securis, 401, 403. 

 parasite of, 40^. 

 Plagiotomida;, 333. 

 plana, Anodonta,403, 406. 

 Planarians, 407. 



Plankton, centrifugal machine used 

 in volumetric determination of, 

 19, 20. 

 description of apparatus used in 

 oblique-haul method of 

 collecting, 3 10. 

 in pumping method of col- 

 lecting, 13-16. 



