GLOSSARY. 



379 



Ovoviviparous. A term applied to animals which retain the eggs 



within their bodies until they are hatched. 

 Pachydermata. An order of Mammalia. 

 Pallium. (Lat. a cloak.) The " mantle " of mollusks. 

 Palpi. (Lat. palpo, I touch.) Organs of touch connected with the 



mouth appendages of Arthropoda. 

 Pedicellariae. (Lat. pedicelkis, a louse.) Curious appendages attached 



to the sea-urchins. 



Pelagic. Living on the high-seas in mid-ocean. 

 Perennibranchiata. (Lat. perennis, perennial ; branchia, gill.) Ba- 



trachians retaining their gills during life. 



Perissodactyla. (Gr. epi<r<r<fe, uneven ; SOKTV\OS, finger.) Uneven- 

 toed ungulates. 



Peritonaeum. (Gr. irepl, around ; reW, I stretch.) 

 Phyllopoda. An order of Crustacea. 

 Pinnigrada. A group of Carnivora. 

 Plagiostomi. An order of fishes. 



Planarida. (Gr. wAeur/, wandering.) A group of Turbellaria. 

 Plesiosaurus. An extinct order of Reptilia. 

 Pluteus. The larval form of Echinoidea. 

 Pneumatocyst. The float of certain Hydrozoa. 

 Podophthalmia. An order of Crustacea. 



Polype. (Gr. voAvs, many ; vovs, foot.) Separate coral animals. 

 Polyzoa. (Gr. n-oXus, many ; wov, an animal.) A class of worms. 

 Protoplasm. (Gr. vporos, first ; irAoor.ua, from irAdWto, I mold.) The 



primitive basis of organic tissue. 

 Protozoa. (Gr. vporos, first ; <W, an animal.) The lowest forms of 



animal life. 

 Pseudopodia. (Gr. tyevSos, false ; irovs, foot.) Temporary foot-like 



processes of Protozoans. 



Pteropoda. (Gr. inepAv, wing ; u-ofs, foot.) A class of pelagic mollusks. 

 Pupa. The third stage in insects. 

 Ratitae. (Lat. ratio, a raft.) Birds with unkeeled sterna ; ostriches, 



etc. 

 Rhizopoda. (Gr. pia, root ; irois, foot.) Protozoans with root-like 



processes. 



Rodentia. (Lat. redo, I gnaw.) An order of Mammalia. 

 Rotiferera. (Lat. rota, a wheel ; fero, I bear.) A class of wormsl 

 Ruminantia. The cloven-footed quadrupeds. 

 Selachia. The family of sharks. 

 Septa. (Lat. partitions.) Applied to the walls of the chambers of 



the nautilus, etc. 



