PLATE II 



THE EARLIEST EMBRYOS OF CHLAMTDOSELACHUS OBTAINED 

 BY BASHFORD DEAN 



Fig. 15. The earliest embryo (11.5 mm.) of Chlamydoselachus figured by Dean. Original drawing = 121 mm. 



Note the attachment of the embryo to the yolk sac by a short yolk cord. 



Fig. 16. The 11.5-mm. embryo stained, cleared, and drawn considerably enlarged — to 161 mm. 



Fig. 17- A larger embryo (15.5 mm.) shown in lateral aspect. The original drawing measures 177 mm. 



Fig. 18. The largest (20 mm.) of Dean's very small embryos of the frilled shark. The original drawing 



measures 222 mm. 



Fig. 19. Dorsal view, head only, of Nishikawa's 32'mm. embryo, considerably enlarged. 



Fig. 20. Lateral aspect, the head only, of Nishikawa's 32-mm. embryo. 



Fig. 21. Head only of Nishikawa's 32'mm. embryo seen from below. 



Fig. 22. Dorsal aspect of head only of Dean's 34-mm. Chlamydoselachus. 



Fig. 23. Lateral view — full-length — of the 34-mm. embryo. 



Fig. 24. Ventral aspect of the head only of Dean's 34-inm. specimen. 



Fig. 25. Dean's 39-mm. embryo portrayed in full-length lateral aspect. 



All the figures on this pkte are reduced by one-third — i.e., are reproduced 

 two-thirds the sizes of the original drawings. 



