xii TABLE OF CONTENTS. 



/( ><>u H}Y Continued. 



Protection, Resemblance, and Coloration Page 410 



( reneral Embryology 422 



In\ i B i i BB \ n.s 423 



Protozoa 423 



Echinoderms 428 



Worms 428 



Mollusks 432 



( Srnstacearis 436 



Insects 442 



VERTEBRATE ZOOLOGY. By Professor Throdork Gill, of Washing- 

 ton, D. C 455 



Introductory 455 



Origin of Vertebrate Limbs 456 



Fishes, etc 458 



North American Fresh-water Fishes 458 



Vascular Dentine and Movable Teeth in Fishes 460 



Various Physiological Adaptations of Fishes for Aerial Respiration. 462 



Egg-laying Sharks and Rays 464 



Oeep-sea Fishes 464 



Annual Fishes 406 



Fresh-water Suckers 407 



The North American Trout and Salmon 467 



Deep-sea Angler Fishes 470 



Amphibians and Reptiles. . 472 



Differences in Development of New-born Salamanders 472 



Natural Selection Exhibited in the Development of Amblystoma 



Larvae 474 



Oral Gestation in Amphibians 476 



Reptiles Nearest to Mammals 476 



Birds 477 



The Pubic Bones of Birds 470 



The Moulting of Parts of ^he Corneous Covering of Bills in Birds. . 470 



The Genus Mcsites 481 



A False I 'nder-tail in Storks 482 



Mammals 483 



The Primary Zoogeographical Regions of the Earth as Determined 



by the Mammals 4S1 



The Species of Hats 487 



Suborder Rlicrochiroptera \ 



Family Vespertitianidae.. 400 



Group 1. Plccoti ) 



Whales of the Ziphiid Family 401 



Size of the Tiger _ 4;)^ 



The Alleged Hermaphrodism of the 1 1 vena 403 



The Placenta] Characteristics of the Sirenians 404 



A Supposed NVw Gorilla 405 



