CONTENTS OF VOLUME I. 



CHAPTER IX. MOLLUSCA. 



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

 and Pteropoda, pp. 175742. Cephalopo<ia, pp. 242254. Polyplacophora, 

 pp. a m 357. Scaphopoda, pp. 257, 758. Lamellibramhiata, pp. 258 269 

 General review of Mollnscan Larva, pp. 270273. Development of organs, 

 pp. 



CHAPTER X. POLYZOA. 



Entoprocta, pp. 291797. Ectoprocta, pp. 297305. Summary and 

 general considerations, pp. 305 308. 



CHAPTER XI. BRACHIOPODA. 



Development of the layers, pp. 31 1313. 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. CHJETOPODA. 



Formation of the germinal layers, pp. 319 325. The larval form, pp. 325 

 338. Formation of organs, pp. 338 342. Alternations of generations, pp. 

 34. 343- 



CHAPTER XIII. DISCOPHORA. 



Formation of layers, pp. 347350. History of larva, pp. 351 354. 



CHAPTER XIV. GEPHYREA. 



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

 considerations, 364. 



CHAPTER XV. 



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

 P- 370- 



CHAPTER XVI. 



Nematelminthes, pp. 370379. Acanthocephala, pp. 379381. 



CHAPTER XVII. TRACHEATA. 



I'rototrachcata, pp. 381387. Myriapoda, pp. 387395. Insecta, pp. 395 

 429. Embryonic mcmbrants and the formation oj ' the layers, pp. 400 406. Forma- 

 tion of the organs, pp. 406 417. Spec ial types of larvcc, pp. 417 419. Mctamor- 

 fikoiis and heterogamy, pp. 420419. Arachnida, pp. 431 455. Formation 

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

 pp. 446455' Formation of the layers and embryonic envelopes in the Tracheata, 

 PP- 456458. 



