x CONTENTS OF VOLUME I. 



CHAPTER IX. MOLLUSCA. 



Formation of the layers and larval characters, pp. 186226. Gasteropoda 

 and Pteropoda, pp. 186200. Cephalopoda, pp. 200210. Polyplacophora, 

 pp. 210213. Scaphopoda, p. 213. LameUibranchiata, pp. 213223. General 

 review of Molluscan Larvae, pp. 224226. Development of organs, pp. 227239. 



CHAPTER X. POLYZOA. 



Entoprocta, pp. 242246. Ectoprocta, pp. 246253. Summary and general 

 considerations, pp. 253 255. 



CHAPTER XI. BRACHIOPODA. 



Development of the layers, pp. 257, 258. The history of the larva, pp. 258 

 262. Development of organs, p. 262. General observations on the affinities 

 of the Brachiopoda, pp. 262, 263. 



CHAPTER XII. CII^TOPODA. 



Formation of the germinal layers, pp. 264269. The larval form, pp. 269 

 280. Formation of organs, pp. 280283. Alternations of generations, pp. 

 283, 284. 



CHAPTER XIII. DISCOPHORA. 



Formation of layers, pp. 287290. History of larva, pp. 290293. 



CHAPTER XIV. GEPHYREA. 



Gephyrea nuda, pp. 294 299. Gephyrea tubicola, pp. 299301. General 

 considerations, 301. 



CHAPTER XV. 



Chastognatha, pp. 303305. Myzostomea, pp. 305, 306. Gastrotricha, 

 p. 306. 



CHAPTER XVI. 



Nematelminthes, pp. 307 313. Acanthocephala, pp. 313 315. 



CHAPTER XVII. TRACHEATA. 



Prototracheata, pp. 316 320. Myriapoda, pp. 320 327. Insecta, pp. 327 

 356. Embryonic membranes and the formation of the layers, pp. 331 336. Forma- 

 tion of the organs, pp. 337 345. S2)ecial types of larva, pp. 345348. Metamor- 

 phosis and heterogamy, pp. 348355. Arachnida, pp. 357377. Formation of 

 the layers and general development, pp. 357 369. Formation of the organs, 

 pp. 369 377. Formation of the layers and embryonic envelopes in the Tracheata, 

 pp. 377379. 



