CONTENTS OF VOLUME I. xi 



CHAPTER XVIII. CRUSTACEA. 



History of larval forms, pp. 459 511. Branchiopoda, pp. 459 465. Mala- 

 costraca, pp. 465 487. Copcpoda, pp. 487 492. Cirripcdia, pp. 492 500. 

 Ostracoda, pp. 500 502. Phylogcny of the Crustacea, pp. 502 511. The forma- 

 tion of the germinal layers, pp. 511 521. Comparative development of organs, 

 pp. 521529- 



CHAPTER XIX. 



Pcecilopoda, pp. 534538. Pycnogonida, pp. 538, 539. Pentastomida, 

 pp. 539 541. Tardigrada, p. 541. Summary of Arthropodan Development, 

 PP- 541543- 



CHAPTER XX. ECHINODERMATA. 



Development of the germinal layers, pp. 544 553. Development of the 

 larval appendages and metamorphosis, pp. 553 573. Summary and general 

 considerations, pp. 573 576. 



CHAPTER XXI. ENTEROPNEUSTA. Pp. 579 583. 

 INDEX. Pp. 584 590. 

 APPENDIX. 



