X CONTENTS OF VOLUME I. 



CHAPTER IX. MOLLUSCA. 



Formation of the layers and larval characters, pp. 225 273. Gasteropoda 

 and Pteropoda, pp. 225 242. Cephalopoda, pp. 242 254. Polyplacophora, 

 pp. 254 257. Scaphopoda, pp. 257, 258. Lamellibranckiata, pp. 258 269 

 General review of Molhiscan Larva, pp. 270 273. Development of organs, 

 pp. 273288. 



CHAPTER X. POLYZOA. 



Entoprocta, pp. 292297. Ectoprocta, pp. 297 305. Summary and 

 general considerations, pp. 305 308. 



CHAPTER XI. BRACHIOPODA. 



Development of the layers, pp. 311 313. The history of the larva, pp. 313 

 317. Development of organs, p. 317. General observations on the affinities of 

 the Brachiopoda, pp. 317, 318. 



CHAPTER XII. CH^ETOPODA. 



Formation of the germinal layers, pp. 319325. The larval form, pp. 325 

 338. Formation of organs, pp. 338342. Alternations of generations, pp. 

 342, 343- 



CHAPTER XIII. DISCOPHORA. 



Formation of layers, pp. 347 350. History of larva, pp. 351 354. 



CHAPTER XIV. GEPHYREA. 



Gephyrea nuda, pp. 355 361. Gephyrea tubicola, pp. 361 364. General 

 considerations, 364. 



CHAPTER XV. 



Chsetognatha, pp. 366369. Myzostomea, pp. 369, 370. Gastrotricha, 

 P- 370. 



CHAPTER XVI. 



Nematelminthes, pp. 370 379. Acanthocephala, pp. 379 381. 



CHAPTER XVII. TRACHEATA. 



Prototracheata, pp. 382 387. Myriapoda, pp. 387 395. Insecta, pp. 395 

 429. Embryonic membranes and the formation of the layers, pp. 400 406. Forma- 

 tion of the organs, pp. 406 417. Special types of larva, pp. 417 419. Metamor- 

 phosis and heterogamy, pp. 420 429. Arachnida, pp. 431 455. Formation 

 of the layers and general development, pp. 431 446. Formation of the organs, 

 pp. 446 455. Formation of the layers and embryonic envelopes in the Tracheata, 

 pp. 456458. 



