INDEX. 
489 
VIVIPAROUS PISHES OF THE PACIFIC COAST. 
Page. 
Introductory note 401 
Viviparous fish of the Pacific Coast 401 
Types of viviparity in Teleosts 404 
Historical notice of Embiotocidce 405 
Cymatog aster aggregatus Gibbons 412 
Breeding habits 412 
Methods of studying living eggs 412 
Methods of studying living larvse 413 
Connection of the developing egg and larva with 
the ovarian structures 413 
Position of larvae in the ovary 413 
Intraovarian food 414 
Intraovarian respiration 415 
Duration of gestation and adolescence and num- 
ber of young 415 
The ovary 418 
Secondary sexual characters in Oymatogaster 419 
Copulation 419 
Development of ovarian eggs 421 
The mature egg 421 
Segmentation 424 
Gastrulation 428 
Page. 
Gymatogaster aggregatus — Continued. 
Explanations of figures and diagrams 436 
Periblast 437 
Yolk nucleus 440 
Significance of the yolk nucleus 441 
Comparison between the processes of conjugation 
in ciliate infusoria (modified from Weismann 
after Maupas) and of maturation and segmenta- 
tion in Gymatogaeter aggregatus 446 
Formation of the mesoderm 446 
Anatomy of an embryo with three protrovertebrse 449 
General development of the larva.' 450 
Formation of the intestine 451 
Kupffer’s vesicle 456 
N eurenteric canal 458 
Kupffer’s vesicle in general 459 
Formation of liver and air-bladder, mouth, thyroid 
gland, and hypophysi s 461 
Gills 464 
Summary of conclusions 465 
Bibliography 468 
Explanations of plates 472 
