GENERAL CLASSIFICATION. 



423 



Ge7teral Classificatioji. 



rCarinatas (flying). 



Birds \ Ratita; (running). 



I^Saururas (extinct). 



Crocodilia (croco- 

 diles, &c.). 



Ophidia (snakes). 



Lacertilia (lizards, 

 &c.). 

 Rkptiles Rhynchocephalia— 

 Sphenodon. 



Chelonia (tortoises, 

 &c.). 



Extinct Reptiles — 

 (many classes). 



Mammals. 



3. Eutheria, Placentalia, Mono- 

 delphia : the higher placen- 

 tal mammals. 



2. Metatheria, Marsupialia, Di- 

 delphia : Kangaroos, &c. ; 

 young born precociously, 

 usually nurtured in pouches. 



. Prototheria, Monotremata, 

 Ornithodelphia ; oviparous, 

 Ornithorhynchus and Ech- 

 idna. 



Sauropsida. 



Mammalia. 



Aniniota, embryos with amnion and allantois. 



Fishes. — Dipnoi (double breath- 

 ing mud fishes). — 

 Teleostei (modern 



bony fishes). 

 Ganoidei (sturgeon, 



&c.). 

 Elasmobranchii (incl. 

 Holocephah), skate, 

 shark, «S:c. 



Amphibians. 



Anura (tailless frogs, &c.). 

 Urodela (tailed newts, &c.). 

 Gymnophiona (worm-like 



Ccecilia, ^c). 

 Extinct Stegocephala [La- 



bvrinthodon, &c.). 



Ichthyopsida (fishes and amphibians). 



CvCLOSTOMATA (Round Mouths), without true jaws. 

 iMyxi?ie, hag fish. Petromyzon, lamprey. 



Surviving offshoots of ancestral Vertebrates. 



Hemichorda, or Enteropneusta (offshoots of incipient Vertebrates?) 



Balanoglossiis, &c. ; probably Cephalodiscus : possibly Rhatdoplem-a. 



Nemertean affinities (i-) Chostopod affinities (?) Arthropod affinities (?) 



