TABLE OF CONTENTS. Vll 



PAGES 



CHAPTER XIV. THE TYPE ARACHNIDA 435-468 



The General Characteristics of the Type, pp. 435-441. Descrip- 

 tion of the Various Orders, pp. 441-456. The Phylogeuy 

 of the Arachnida, pp. 456-458. Synoptical Classification, 

 pp. 458, 459. Literature, pp. 459, 460. The Order Peuta- 

 stomidae, pp. 461-463. The Order Pycuogonida, pp. 483- 

 466. The Order Tardigrada, pp. 466-468. Literature, p. 

 468. 



CHAPTER XV. THE TYPE TRACHEATA 469-530 



The General Characteristics of the Type, pp. 469-474. The 

 Class Protracheata, pp. 474-480. The Class Myriapoda, 

 pp. 480-487. The Class Insecta, pp. 487-522. The Phy- 

 logeuy of the Tracheata, pp. 523-525. Synoptical Classifi- 

 cation, pp. 525-528. Literature, pp. 528-530. 



CHAPTER XVI. THE TYPE ECHINODERMA 531-595 



The General Characteristics of the Type, pp. 531-540. The 

 Class Crinoidea, pp. 541-551. The Class Asteroidea, pp. 

 552-560. The Class Ophiuroidea, pp. 561-570. The Class 

 Echinoidea, pp. 570-584. The Class Holothuroidea, pp. 

 584-590. The Phylogeny of the Echinoderma, pp. 590- 

 592. Synoptical Classification, pp. 592, 593. Literature, 

 pp. 593-595. 



CHAPTER XVII. THE TYPE PROTOCHORDATA 596-641 



The Class Hemichorda, pp. 596-608. The Class Cephalochorda, 

 pp. 608-618. The Class Urochorda, pp. 618-639. Synop- 

 tical Classification, pp. 639, 640. Literature, pp. 640, 641. 



INDEX OF PROPER NAMES 643-653 



INDEX OF SUBJECTS., ... 654-661 



