500 GLOSSARY. 



which are now placed Id separate sub-kingdoms {e. g. , the Ccelenterata, the 

 Echinodcrmata, the Infusoria, &c.) 



Eadiolaria (Lat. radius, a ray). A division of Protozoa. 



Eadius (Lat. a spoke or ray). The innermost of the two bones of the fore- 

 arm of the higher Vertebrates. It carries the thumb, when present, and 

 corresponds with the tibia of the hind-limb. 



Kami's (Lat. a branch). Applied to each half or branch of the lower jaw, or 

 mandible, of Vertebrates. 



Eaptoees (Lat. rajjto, I plunder). The order of the Birds of Prey. 



Kasokes (Lat. rado, I scratch). The order of the Scratching Birds (Fowls, 

 Pigeons, &c.) 



PiATiT.E (Lat. rates, a raft). . Applied by Huxley to the Cursorial Birds, which 

 do not fly, and have therefore a raft-like sternum without anj'' median keel. 



Kectum (Lat. rectus, straight). The terminal portion of the intestinal canal, 

 opening at the surface of the body at the anus. 



Reptilia (Lat. rejito, I crawl). The class of the Vertehrata, comprising the 

 Tortoises, Snakes, Lizards, Crocodiles, &c. 



Eeveesed. Applied to spiral Univalves, in which the direction of the spiral 

 is the reverse of the normal — i. e. , sinistral. 



Ehizophaga (Gr. rhiza, root; phago, I eat). A group of the Marsupials. 



Ehizopoda (Gr. rhiza, a root; and ^oms, foot). The division of Protozoa, com- 

 prising all those which are capable of emitting pseudopodia. 



Ehtncholites (Gr. rhuncJws, beak; and lithos, stone). Beak-shaped fossils 

 consisting of the mandibles of Cephalopoda. 



Eodextia (Lat. rodo, I gnaw). An order of the Mammals ; often called Glircs 

 (Lat. glis, a dormouse). 



Rugosa (Lat. rugosus, wrinkled). An order of Corals. 



EuMixANTiA (Lat. ruminor, I chew the cud). The group of Hoofed Quadru- 

 peds {Ungulata) wliich. "ruminate " or chew the cud. 



Sacpxm. The vertebrae (usually anchylosed) which unite with the haunch- 

 bones {ilia) to form the pelvis. 

 Sand-caxal (= Stoxe-caxal). The tube by which water is conveyed from 



the exterior to the ambulacral system of the Echi/wderrnata. 

 Saecode (Gr. sarx, flesh ; cidos, form). The jelly-like substance of which the 



bodies of the P/'o^oroa are composed. It is an albuminous bodj- containing 



oil-granules, and is sometimes called " animal protoplasm." 

 Sarcoids (Gr. sarx; and eidos, form). The separate amoebiform particles 



which in the aggregate make up the "flesh" of a Sponge. 

 Saueia (Gr. saura, a lizard). Any lizard-like Eeptiie is often spoken of as a 



" Saurian ; " but the term is sometimes restricted to the Crocodiles alone, or 



to the Crocodiles and Lacertilians. 

 SArEOBATE.-vcHiA {Gv.^saura ; hatrachos, fi'og). Sometimes applied to the 



order of the tailed Amphibians (Urodela). 

 Sauropsida (Gr. satira ; and ops-is, appearance). The name given by Huxlej' 



to the two classes of the Birds and Eeptiles collectively. 

 Sauropterygia (Gr. saura; p)tcrux, wing). An extinct order of Reptiles, 



called by Huxley Plesiosauria, from the typical genus Plcsiosaurus. 

 SAURUR.E (Gr. saura ; oura, taU). The extinct order of Birds comprising only 



the Archmopterijx. 



