PLATE I 

 EGGS AND EGG CAPSULES OF CHLAMTDOSELACHUS 



Fig. 1. A ripe ovarian egg of the frilled shark. The original drawing measures 90 x 96 mm., and is pre- 

 sumably in natural size. See also Text-figure 12. 



Fig. 2. An asymmetrical oblong egg of the frilled shark. The asymmetry of this egg probably originated 

 during the process of shell formation. 



Fig. 3. A symmetrical oblong egg of Chlamydoselachus surrounded by its transparent keratinoid capsule. 



Fig. 4. A round egg of the frilled shark — C of Dean's list. 



Fig. 5. Another encapsuled round egg — numbered B by Dean. 



Fig. 6. A third round egg — numbered A by Dean. 



Fig. 7. An ellipsoidal encapsuled egg having a 43-mm. embryo attached by a yolk stalk. 

 This figure is a copy of Nishikawa's drawing portrayed in natural sik in Text-figure 4. 



Fig. 8. The vitelline blood vessels on the under side of the egg portrayed in Figure 7- 



After Nishikawa, 1896, Fig. 2, pi. IV. 



Fig. 9. An ellipsoidal encapsuled egg with an older embryo (50 mm.) and a slightly more advanced vitelline 

 circulation than that seen in Figure 7- 



Fig. 10. Underside of the egg shown in Figure 9. The yolk-sac circulation is slightly more advanced than 

 that portrayed in Figure 8. 



Fig. 11. A 175-mm. embryo of Chlamydoselachus attached to its yolk sac and without its capsule. 



Fig. 12. Under side of egg portrayed in Figure 11. This shows a late stage of the vitelline blood vessels. 



Fig. 13. A tendriUform process from the capsule of an asymmetrical oblong egg in the collections of Co- 

 lumbia University. This process is similar to that seen in Figure 2. 



Fig. 14. A much-branched tendriliform process. Note its close similarity to those shown in Figures 13 

 and 2. 



Each figure on this plate save number 13 is half the size of the original, and hence is presumably one halt natural size. 



Figure 13 is the only figure on these six plates not drawn by or for Dr. Bashford Dean. 



