PLATE VII 



EGG CAPSULES, EGGS, EMBRYOS 

 AND XE\^T.Y HATCHED YOL'NG OF HETERODO?iTUS JAPOJilCUS 



Fie. 76. An eag capsule in side view. The arrow points towards the respirator}^ groove, just beginning to 

 deepen and lengthen into the respiratory cleft. The length of the capsule varies from 120 to 

 180 mm. (four to seven inches). 



Fig. 77. Oral, upper or proximal \-iew (shov-^ng the larger end) of the capsule. 



Fig. 78. An egg case opened to show the yolk sac and embryo v.rithin. 



Fig. 79. Upper hemisphere of an egg at the time of deposition. This figure shows the tiny germinal disc 

 (reddish, surrounded by a white zone) and some problematical furrows distributed over the 

 greater part of the surface of the yolk. 

 Reproduced about four-fifths natural size. 



Fig. 80. A late blastula drawn as an opaque object seen through a layer of albumen. The blastoderm is 

 limited to the reddish area, which is surrounded by a pale yellowish zone, the periblast. 



Fig. Si. Ad\'anced embryo ■w.'ith yolk stalk and yolk sac. The figure is slightly larger than natural size. 

 The external gill-filaments have reached their maximal development. 



Fig. 82. Later embr>'0 v,^th yolk stalk and yolk sac. In some respects (e.g., the position of the nasal apertures) 

 this embr\'o is either distorted, abnormal or incorrectly drawn. 



Fig. S3. Dorsal \-iew of a newly hatched Heterodontusja]:'onicu5. Its length is about 180 mm. (seven inches). 



Fig. 84. Lateral \-iew of a young female Heterodontus japonicus, about two weeks after hatching. Its length 

 is about 205 nam. (eight inches). 



All the figures of this plate are in natural colors. 



