58i 



Phacus Continued. 



pyrum, 313, 326. 



triquetur, 326. 

 plialeratus, Cyclops, 2q, 30, 59, 63,65. 

 Pliauk)mytilus as new genus for 



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



397- 

 Plienacaspis as new genus fnr cer- 

 tain species of Chionaspis, 398. 

 Pliiladel])hia Academy of Sciences, 



418. 

 piiiladelphica, Astacobdella, 542. 

 philadelphicus, Bdellodrilus, 542. 

 Pliilliljs, C. E., g8. 

 Pliilobdella, 509, 510, 511. 

 floridana, 51 1. 



lumbricoid worm eaten In', 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. 

 megalotroclia, 363. 

 roseola, type of troplii of, 345. 

 seasonal distribution of, 352. 

 tuberculata, 363. 

 Philodinida;, 357, 359, 362. 

 Phreoryctes emissarius, 442. 

 Phreoryctida?, 442. 



found in Illinois, 442. 

 Pliysa, Epistylis [ilicatilis found nn 



shells of, 339. 

 Pickering, C, generic description 



of Scopiphora \agans, 263. 

 Picronitic acid, formula for, 349. 

 pilosus, Vermiculus, 446, 450, 452. 

 Pilsbry, H. A., 418. 

 piricola, Uiaspis, 398. 



Piscicola jiarasitic on small tish, 



504. 

 Piscicolaria, 504. 

 piscinae, 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. 

 Iiabits of, 486. 



reproductive organs of, 484. 

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

 alimentary canal, color, and 

 reproductive organs of, 491. 

 amuili and somites of, 488-491. 

 diagnosis and general descrip- 

 tion of, 487. 

 habits of, 492. 

 Plagiola, capacity for infestation 

 exliibited by, 414. 

 donaciformis, 401, 403. 



parasites of, 409,410,412,416. 

 elegans, 401, 403. 



parasites of, 405, 406, 409, 410, 

 412, 413, 416. 

 securis, 401, 403. 

 parasite of, 409. 

 I^lagiotomidae, 333. 

 plana, Anodonta, 403, 406. 

 Planarians, 407. 



Plankton, centrifugal machine used 

 in \H)lumetric determination of, 

 19, 20. 

 description of apparatus used in 

 obli(iue-haul method of 

 collecting, 3 10. 

 in pumping method of col- 

 lecting, 13 16. 



