154 MCMURRICH. 



EXPLANATION OF PLATE IX. 



Fig. 65. Section through the thoracic region of an embryo of Cymothoa in a 

 stage somewhat later than that represented in Fig. 62. 



Fig. 66. Section through the second thoracic appendage of an embryo of 

 Cymothoa older than that from which Fig. 65 was taken. 



Fig. 67. Section through the abdominal region of an embryo of Cymothoa in 

 which the yolk is beginning to disintegrate, en == chromatin nebula. 



Fig. 68. Section through the thoracic region of an embryo of Cymothoa in 

 which the disintegration of the yolk is complete. 



Fig. 69. Anterior portion of an embryo of Cymothoa. 



Fig. 70. Anterior portion of an embryo oi/aera. 



Fig. 7 1 . Lateral view of an advanced embryo of Jaera. 



Fig. 72. Lateral view of an embryo oi Jaera almost ready to hatch. 



