CONTENTS OF VOLUME I. xi 



CHAPTER XVIII. CRUSTACEA. 



History of larval forms, pp. 380 425. Branchiopoda, pp. 380 385. Mala- 

 costraca, pp. 385404. Copepoda, pp. 404409. Cirripedia, pp. 409 415. 

 Ostracoda, pp. 415 417. Phylogeny of the Crustacea, pp. 417425. The forma- 

 tion of the germinal layers, pp. 425 433. Comparative development of organs, 

 pp. 433440. 



CHAPTER XIX. 



Pcecilopocla, pp. 444447. Pycnogonida, pp. 448, 449. Pentastomida, 

 pp. 449, 450. Tardigracla, p. 450. Summary of Arthropodan Development, 

 pp. 451, 452. 



CHAPTER XX. ECHINODERMATA. 



Development of the germinal layers, pp. 453 461. Development of the larval 

 appendages and metamorphosis, pp. 461 478. Summary and general 'considera- 

 tions, pp. 478480. 



CHAPTER XXI. ENTEROPNEUSTA. Pp. 482 485. 



INDEX. Pp. 486492. 

 APPENDIX. 



