EX 



541 



1 )c nil r viae na, 382 



Dendrocoelum, 30, 35, 39 



Pendrostoma, 422, 425, -428 



Deudy, on Land Planarians, 33, 34, 38 



Denticles, 248, 250, 316, 522 



Dew, 352, 377 



Derostoma, 44, 50 



Desmogaster, 380 



Desmoscolecidae, 159 



Desmoso>l<\<\ 159, 258 



Desor, on Neniertine development, 99 ; 

 Type of, larva, 113 



Development, of Polyclads, 28 ; of Nemer- 

 tinea, 99, 113 ; of Nematoda, 135 ; of 

 Qordiw, 171 ; of Acanthocephala, 179 ; 

 of Chaetognatha, 189 ; of Rotifers, 218 ; of 

 Archiannelida, 243, 245 ; of Polychaeta, 

 274 f. ; of Oligocliaeta, 365 ; of Leeches, 

 399 ; of Gephyrea, 419, 432, 439, 447 ; 

 of Phownis, 458 ; of Polyzoa, 506, 509 

 see also Life-history and Larva 



Diachaeta, 366 



Diaphragm, of Nereis introvert, 250, 251 ; 

 of Terehellidae, 304, 327 ; of Polyzoa, 

 469, 470, 500, 508 



Diaschiza, 226, 226 



Diastopora, 518, 531 



Dichogaster, 362, 383 



Diduhphoru, 73 



Dicotylus, 32, 35, 36, J$ 



Picranotaenia, 91 ; D. coramtfa, life- 

 history, 84 



Dicyema, 93; vermiform larva of, 92: 

 hosts of, 94 



bici/eme.ituea, 93, 93 ; hosts of, 94 



Dicyemidae, 92 f. 



Didymogaster, 383 



Didymozoon, 73; P. thy a ni ( = Monostom urn 

 In'partitum), 71 



Didymozoontidae, 73 



Pigaster, 358, 359, 382 f. 



Digenea (Digenetic Trematodes), 5, 52, 62, 

 73 ; occurrence and habits, 62 ; life- 

 histories, 63 f., 71 f. 



Digestive system, of Leptoplana, 11, 12; 

 of Polyclads, 24 ; of Triclads, 37, 39 ; 

 of Rhabdocoelida, 42 f. ; of Temnocephala, 

 53, 54 ; of Polystomnm, 57 ; of Pisto- 

 mvin, 62 ; absence of, in Cestodes, 74; 

 of Nemertinea, 103, 103, 104 ; of Nema- 

 toda, 130 ; of Gordiidae, 166, 169 ; of 

 Chaetognatha, 187 ; of Rotifers, etc., 209, 

 233, 237 ; of Archiannelida, 243 ; of 

 Polychaeta, 249, 269 ; of Oligocliaeta, 

 358 ; of Hirudinea, 396 ; of Gephyrea, 

 414 ; of Phoronis, 454 ; of Polyzoa, 

 468, 469, 487 



Digiiibranchus, 353 



Piglena, 212, 217, 2:24, 226 



Digonopora, 16 



Dimorphism, in Polystomum, 59 ; sexual, 

 of Trematodes, 70 ; of Orthonectida, 95 ; 



of Diuophilm, 243 ; of Polychaeta, 27'>, 

 279 f.; of Gephyrea, 438 



Dinocharididae, 225 



Dinochwris, 225 



Pinophilus, 242 ; J), taeniatos, 242 : I), 

 gyrociliatus, sexual dimorphism, 248 



Pinops, 223 



Piopatra, gill, 318 



Diphyllinae, 91 



Piplax, 225 



JJiplectanum, 73 



Diplobothrium, 73 



Diplocardia, 385 



Diplodiscus, 73; D. (Amphistomum) *,<!,- 

 clavatum, life-history, 71 



Diplogaster, 154 



Diplois, 225 



IHplostoviunt, 73 



Diplozoon, 55, 60, 73 ; life-history, 60, 61 ; 

 reproductive organs, 60 



Diporochaeta, 381 



Diporpa, 60, 61 



biporula, 528 



Dlpylidium, 81, 91 ; life-history, 83, 88, 

 89 ; specific characters, 90 



Disc, in Rotifers, 200, 202 f., 202 



Discharge, of genital cells ; Nemertinea, 

 116 ; Archiannelida, 244 ; Polychaeta, 

 256, 274, 275 



Discobdella, 226 



Discocelis, 19, 23 



Discodrilidae, 350, 376, 392, 395 



Discopus, 201, 222, 226, 227 



Dlspharagus, 147, 149, 163 



Dispinthera, 225 



Distemma, 212, 224, 226 



Distomatidae, 73 



Distomum advena (=D. migrans), life- 

 history, 71 ; P. tippeitdieuUilnia, life- 

 history, 71 ; P. ascidia, life-history, 71 ; 

 D. atriventre, life-history, 71 ; P. brachy- 

 somum, life-history, 71 ; P. buskii, 63 ; 

 P. caudatum, life-history, 71 ; P. davi- 

 gemm, life-history, 72 ; P. eenjwnctntmi, 

 63 ; P. crassum, 63 ; P. cygnwides, life- 

 history, 72 ; P. cyiindracmtn, 72 : I>. 

 dimorphum, 72 ; P. eehvnatvm, 63 ; life- 

 history, 72 ; P. echiuri, 444 ; P. mdo- 

 lobum, life-history, 72 ; P. ezcava&tm, 

 63 ; P. ferox, 63 ; P. fflobip&rum, life- 

 history, 72 ; P. Mans, 63 ; P. hepccticwm 

 (liver-fluke), 3, 63, 67 f., 72; D.hetmh 

 phyes, 63; P. hystrix, life-history, 72 : 

 P. japonicum ( = P. spatkulatwH), 63; 

 P. lanceolatum, 63 : P. lufami, excre 

 tory system of, 62; J). macrostomnm t 

 life-history, 64, 65, 72 ; P. wutgmn 

 P. militare, life-history, 72 : ]>. ,m,/)>- 

 losum, life-history, 72 ; P. ocuti-humani 

 ( = />. ophtkabnobium), 63 ; D.owcauda- 

 turn, life-history, 72 ; D.pulmona 

 70 ; P. rathouisi, 63, 70 ; P. retuatm, 



