ii Plate ii. 



mednllary canal entirely closed. The amnion and the cœloinic cavities 

 as in Fig. 12. See p. 26. AAx2. (XXXVIIIa) 



Fig, 14. — Dorsal view of the posterior part of an embryo of Clemtm/s japouica -with. 

 8-9 mesoblastic somites, taken out 6i days after its deposition. See 

 p. 27. AAx2. (Ll/i) 



Fig. 15. — Dorsal view of an embryo of Clemmi/s japomca with about 13 mesoblastic 

 somites, take out 8 days after its deposition. The amnion is produced in 

 an elongated posterior tube. The internal limits of the extra-embryonic 

 cœlomic cavities diverge at' the posterior end ef the embryo proper, but 

 the cavities themselves are now very large. See p. 27. Sections 

 Series XI (PI. IX). aa x 2. (XXXXIII ^ ) 



fTrioiuj.v japonicusj. 



Fig. 24. — Dorsal view of the posterior portion of an embryo of Trionyx Japouiciis, 

 taken out 7^ days after its deposition. The internal limits of the extra- 

 embryonic cœlomic cavities diverge posteriorly but the cavities them- 

 selves go clearly around the posterior limit of the embryonic area. 

 See p. 29. Sections Series VII (PI. VI). AA x 2. (155 D) 



Fig. 25a — Ventral view of the posterior portion of an embryo of Triomjx jajmiicits 

 whose dorsal view is given in Fig. 25 (PI. Ill), taken out 9^ days after 

 its deposition. A A x 2. (151 H) 



Fig. 26rt. — Ventral view of the posterior portion of an embryo of Triomjx japonicus, 

 whose dorsal view is given in Fig. 26 (PL III), taken out 10^ days after 

 its deposition. AAx2. (157 ffl) 



(By an unfortunate mistake, this is marked Fig. 26 on the plate). 



