DEFINITIONS OF SYSTEMATIC NAMES. 



Sirenia, order of marine mammals; 



manatees and dugongs 

 Sirenoidea; order of lung-fishes, containing 



the living species. 



Spalacotherium, genus of extinct mammals. 

 Sphenodon, genus of lizard-like reptiles 



from New Zealand; order Rhyncho- 



cephalia. 

 Squamata, order of reptiles including snakes 



and lizards. 



Stegocephala, order of extinct amphibians. 

 Stegosaurs, family of extinct dinosaur 



reptiles, some very large. 

 Stenops, genus of lemurs. 

 Stenostomus, genus of fishes; scup. 



Teleostomes, fishes with true jaw, includes 



ganoids and teleosts. 

 Teleosts, order of fishes with bony skeleton, 



including all common fishes. 

 Testudo, genus of land turtles. 

 Testudinata, turtles, same as a Chelonia. 

 Tetrapoda, term to include amphibia, 



reptiles, birds, and mammals, which 



have feet in place of fins. 

 Theromorpha, extinct reptiles forming the 



lowest order of the class. 

 Tinnunculus, genus of hawk-like birds; 



kestrel. 



Torpedo' genus of skates with remarkable 



electric powers. 



Trionyx, genus of fresh-water turtles. 

 Triton, genus of tailed amphibian, aquatic, 



European. 

 Tropidonotus, genus of snakes, including 



our water snake. 



Trygon, genus of skates, string- rays. 

 Typhlopidae, family of peculiar tropical 



serpents. 



Ungulates, order of mammals which walk 

 on the tips of the toes; horse, cattle, deer, 

 antelope, etc. 



Urodeles, order of tailed amphibia. 



Varanus, gemis of lizards from Africa. 



Xenarthra, sub-order of American edentates, 



ant-eaters and armadillos. 

 Xenopus, genus of tongueless toads from 



Africa. 



Zeuglodon a genus of extinct whales 



(Cetacea) . 

 Ziphius, genus of toothed whales. 



