670 GLOSSARY 



Orbit, the bony eye-socket. 



Order, a group of the fourth rank in classification, typically including many 



families. 

 Oviparous, egg-laying. 



Palate, hard, the bony roof of the mouth. 



Palatine, one of a pair of bones which form the hinder part of the hard 



palate. 

 Palatine process, a shelf-like projection of the maxillary, which forms most of 



the hard palate on each side. 

 Paleocene, the oldest of the five Tertiary epochs. 

 Palmate, form of antler in which the tines are fused into large plates. 

 Pampean, Pleistocene, perhaps including the uppermost PUocene, of Argentina. 

 Parallelism, or Parallel Evolution, similar development of related, but ssparate 



series. 

 Parand stage, lower Pliocene (or perhaps upper Miocetie) of Argentina. 

 Parietal, one of a pair of large, vaulted bones, which form most of the sides 



and roof of the cranium. 

 Paroccipital process, a bony projection from the infero-external angle of the 



occiput. 

 Patagonian stage, marine lower Miocene of Patagonia. 

 Patella, the knee-cap. 



Pecora, true Ruminants, suborder of Artiodactyla. 

 Pelvic girdle, see Pelvis. 

 Pelvis, the hip-bones. 



Periotic, a small, dense bone, which lodges the internal labyrinth of the ear. 

 Pes, the hind foot. 

 Petrosal, see Periotic. 



Phalanx, one of the joints of the fingers or toes. 



Pholidota, Pangolins or Scaly Anteaters ; order of placental mammals. 

 Phylum, a genetic series of ancestors and descendants within a family. 

 Pilosa, Sloths, Anteaters, etc. ; suborder of Edentata. 

 Pinnipedia, Marine Carnivores ; suborder of Carnivora. 

 Pisiform, an accessory bone attached to the postero-external angle of the 



carpus. 

 Placenta, a temporary structure connecting mother and foetus, by means of 



which the foetus is nourished in the womb. 

 Placental, having a placenta ; the Monodelphia. 

 Pleistocene, the older of the two Quaternary epochs. 

 Pliocene, the fifth and last of the Tertiary epochs. 

 PoUex, the first digit of the manus, or thumb. 

 Polyphyletic, derived from two or more distinct lines of ancestry. 

 Polyprotodonta, Opossums, etc. ; suborder of Marsupials. 

 Posterior nares, the hinder opening of the nasal passage. 



