1899.] 



Nyctale, . 



Nyctidromus 



Obeliscus, 



Ochthoeca, . 



Odouaspis, 



Odonata, 



Odostomia, 152, 1 



Odynerus, . 



CEcidium, . 



Oidemia, 



Oligochsetse, 



Omphalina, . 



Onchidium, . 



Onychogomphu 



Onychotes, . 



Opeas, . 



Ophichthus, 



Ophichthyidre, 



Ophichthys, 



Ophiobleunius, 



Opisthonema, 



Oplegnathidie, 



Oplegnathug, 



Opsariichthys, 



Oreospiza, . 



Ornismya, . 



Oroscoptes, . 



Orpheus, 



Ortalis, . . 



Orthetrum, 22 



Orthocuemus, 



Orthogouys, 



Ortholophus, 



Orthopristi?, 



Orthorhyuchus 



Ortonia, . 



Ortygometra, 



Ortyx, . 



Ostinops, 



Ostraciidffi, . 



Ostraciou, . 



Otocoris, 



Otolithus, . 



Oudablis, 



Ovula, . 



Oxalis, . . 



Oxyurus, 



NATURAL SCIENCES OF PHILADELPHIA. 



569 



370 



28, 2 



29, 



22 



50, 



176, 



228, 



179, 



237, 



>59, 



20 

 52, 



352, 



31 

 305 

 370 

 306 

 274 

 230 

 177 

 407 

 108 



28 

 137 

 395 

 522 

 231 



45 

 398 

 332 

 332 

 332 

 362 

 118 

 359 

 359 

 180 



20 

 206 



15 



15 

 302 

 238 

 202 



35 



37 

 351 

 207 

 261 



12 

 , 25 

 307 

 496 

 496 



21 

 354 

 265 



79 

 222 

 210 



