Opisthobranchs 
Opisthoccelous 
Opisthocomus 
Oppossums . 
Optic chiasma 
foramen 
lobes . 
nerves. . 
thalami . 
Orca. ‘ 
Orchestia . 
Organs. ‘ . 
origin of . 
>» rudimentary 
Oriental region 
Ornithodelphia 
Omithorhynchus . 
Orthoptera 
Orycteropus . 
Oscarella 
Osculum 
2? 
Osphradium of Molluscs 
Ossicles of ear 
Osteoblasts . 3 
Ostracoda ‘ 
Ostracodermi ‘ 
Ostrea . é 
Ostriches . ‘ 
Otaria . a : 
Otocyon =. 
Otocysts = Otoliths 
Otoliths of Vertebrates . 
Otter 
Ova of— 
», Anodonta . 
»» Birds 
»» cockroach . 
»» crayfish 3 
>», earthworm . 
», Echinoderms. 
», Fishes . 
»» fluke. 
» frog. . 
», Hydra. . 
», Monotremes . 
oy Myxine. 
:, Peripatus 
Reptilia , 
Placental Mamma! 
. 
. 
* 
. 
. 
° 
. 
° 
s 
686, 
695, 
INDEX 
PAGE 
420 
571 
690 
746 
709 
723 
487 
-Pallium ‘ 
Ova of—Vertebrates  . 
Oviducal gland of skate 
Oviduct of Vertebrates . 
Oviparous Vertebrates . 
Ovis . 
Ovo- testis of. snail . 
Ovo-viviparous Vertebrates 
Ovulation . ‘ i 
Ovum, the . 5 
maturation of the 
membranes 
the Vertebrates 
» theory ‘ ‘ 
Oxyuris : . . 
Oyster . ‘i 3 . 
oP 
” 
PACHYMATISMA . . 
Pacinian corpuscles. 
Pagurus . , . 
Palearctic region . F 
Paleemon : 
Paleontological series . 
Paleontology ‘ . 
Palzeospondylus . . 
Paleeostraca . . . 
Palzeotherium . 
Palato-pterygo quadrate ci 
tilage . 
Palinurus 
Palisade worm 
Palmipes  . 
Palp . 
Paludicella . 
Paludina ‘ 
Pancreatic juice . 
Panda . ‘ % 
Pandalus. 
Pangolin . 
Panmixia . 
Panniculus adiposus 
i carnosus 
Panorpata . : 
Pantopoda . 
Papillary muscles . 
Parachordals of skull 
Paraglosse . 
Paramcecium 
Parapodia . . 
ed 
around 
‘ar 
