59 
olssoni Rail., 1900, 239, t. h. Apus apus. — 1900; Dicrocoelium. 
onchacanthus M.SLSS3i, 1906, 44, t. h. unknown; Triest. — 1906: Trochopus. 
onchidiocotyle Setti, 1899, 121, t. h. “tonno;” Portoferraio. — 1899: Trist. 
onycephalum Galli-Valerio, 1898, 923, misprint for oxycephaluin (Dist.). 
opaca Bory de St. Vincent, 1823a, 354, in infusions de pois. — 1823: Cere. 
opaca Staff., 1902, 416, t. h. Bufo lentiginosus; America. — 1902; Gorgodera. 1905: 
Gorgoderina. 
opacum Ward, 1894, 173, t. h. Amia calva, Cambarus propinquus, Ictalurus punctatus, 
Perea flavescens; Lake St. Clair. — 1894: List. 1894: D. (Bracliycoelium). 1899: 
Levinsenia. 1901: Micropliallus (type). 
operculataUQrhsi, 1787a, 36. — 1787: Planaria. 
ophthalmobium Dies., 1850a, 334, oculi humani renamed; Dresden. — 1850: Dist. 
1892: Agamodist. 
ophthalmothium Luehe in Stiles, 1903u, 223, for ophthalmobium (Agamodist.). 
opisthotrias Lutz, 1895, 181, t. h. Didelphys aurita. — 1895: Dist. 1899: Harmost. 
1899; Heterolope. 
orhicolare Sons., 1891, 262, misprint for orbiculare (Monost.). 
orhiculare Dies., 1850a, 349, t. h. Cebus trivirgatus; Brazil. — 1850; Dist. 1901: 
Phaneropsolus. 
orhiculare Rud., 1819a, 83, t. h. Spams salpa; Naples. — 1819; Monost. (Monost.). 
1901: Mesometra (type). 
orhis Mueller, 1786, 138, in aqua, ubi Lenina, rarissinie. — 1786: Cere. 1815; Furco- 
cerca. 1827 : Lecane. 
oncoZa Leidy, 1884a, 47, t. h. Alligator mississippiensis; Florida. — 1884: Dist. [1895: 
D. pseudostomum.] 
oncuZa Mont., 1892, 715, misprint for oricola (Dist.). 
ornata LaValette, 1855, 18, t. h. Planorbis corneus. — 1855: Cere. 1858: C. (Acantho- 
cephala). [1858; Dist. clavigerum, type of Pleurogenes 1899.] 
ornata Will.-Suhm, 1870, 9, t. h. Alligator lucius; Charleston. — 1870: Polycotyle 
(type). 
ornata Odhn., 1902, 22, t. h. Nilkrokodil. — 1902; Stephanoprora (type). 
ornatum Leidy, 1856, 43, t. h. Rana pipiens; Phila. — 1856: Monost. 
ornatum Cobbold, 1882a, 240, t. h. Elephas indicus; India. — 1882: Amphist. 1895: 
Pseudodiscus. 
ornithorhynchi Zo\mston, 1901, 334, t. h. Ornithorhynchus anatinus Shaw. — 1901: Dist. 
orphii Ben. & Hesse, 1863, 116; 1864, 116, t. h. Esox belone. — 1863: Axine. [1879: 
A. belones.] 
orthagorisd molse Dies., 1855, 64, based on Bellingham, 1844, 429. — 1855: Dist. [1850: 
D. macrocotyle.] 
orihoccelium Eischder., 1901, 369, t. h. Bos kerabau; Ceylon. — 1901: Paramphist. 
osculatum Looss, 1901, 654, t. h. Motella vulgaris. — 1901: Dist. 
osleri R. Wright, 1879, 66, t. h. Necturus lateralis;? Canada. — 1879; Sphyranura (type). 
oslerii Mont., 1888a, 8, for osleri (Sphyranura). 
oti Rud., 1819a, 354, for otidis, syn. of macrocephaluni. — 1819: Festuc. 
otidis Froelieh, 1802, 53, t. h. Strix otus. — 1802; Festuc. [Amphist. macrocephalum.] 
ovale Goto, 1894a, 241, t. h. Histiophorus orientalis; Misake, August. — 1894; Trist. 
[1899: T. Igeve.] 
ovalis Schrank, 1803, 86. — 1803; Cere. 
ovata Villot, 1878, 20, t. h. Lygia oceanica. — 1878: Cere. 
ovata Rud., 1803a, 25, t. h. Corvus frugilegus. — 1803: Fase. 1809: Dist. 1845: Dist. 
(Dicrocoelium). 1892: Cephalogonimus. 1896: D. (Cephalogonimus). 1899: 
Prosthogonimus (type). 1899: Prymnoprion (type). 1901: Prosthogonimus 
(type). 1902; Prostogonimus. 
ovaZa Linst., 1877, 192. — 1877: Tetracotyle. [1894; Holost. variegatum.] 
ovata Goto, 1894a, 234, t. h. Anthias schegeli; Misaki, Japan, August. — 1894; Epib- 
della. 1902; Trist. 1903: E. (Benedenia). 
ovatum Lint., 1900, 269, t. h. Lobotes surinamensis; Woods Hole. — 1900: Gasterost. 
ovatum Dies., 1850a, 302, for Dist. luteum Baer, 2, 610, pi. 29, figs. 20-22, in Paludina 
vivipara; Regiomontii. — 1850: Heterost. 1858: Cercariseum. [1858. Dist. 
luteum Wagener.] 
