34 J. T. CUNNINGHAM. 
former corresponds to a rupture or hernia in the blastoderm of 
a Teleostean, belonging to the ventral side of the embryo. 
The anterior part of the primitive streak in Sauropsida 
represents the ancestral blastopore. The posterior part repre- 
sents the coalesced uninflected part of the blastodermic rim in 
Elasmobranchii. The edge of the blastoderm in Sauropsida 
corresponds to a hernia in the blastoderm of Elasmobranchs, a 
hernia which belongs to the ventral side of the body of the 
embryo. 
The periblast in Teleostei after the formation of the intestine 
forms part of the splanchnopleural mesoblast. 
List or Papers CITED. 
1. “On the Development of some Pelagic Fish-eggs,” Preliminary Notice. 
By Alexander Agassiz and C. O. Whitman. ‘ Proc. Amer. Acad. of 
Arts and Sciences,’ vol. xx, August, 1884. 
2. “Some Observations on the Embryology of the Teleosts.” By J. 8. 
Kingsley and H. W. Conn. ‘ Memoirs of the Boston Soc. Nat. Hist.,’ 
vol. iii, No. 6, April, 1883. 
3. “A Contribution to the Embryography of Osseous Fishes.” Ey John A. 
Ryder. ‘Report of American Fisheries Commission for 1882,’ Wash- 
ington, 1884. 
4, ‘Studien zur Gastraea-Theorie.’ By Ernst Haeckel, Jena, 1877, p. 91, &c. 
*‘ Die Discoidale Furchung und die Discogastrula.” 
5. “ Unters. i. d. Bildung des Knochenfischembryo (Salmen).” By W. His. 
‘Arch. f. Anat. u. Phys.,’ 1878. 
6. “ Ueber d. Bildung d. Haifischembryonen.” By W. His. ‘ Zeitschr. f. 
Anat. u. Entwicklungsgeschichte,’ vol. ii, 1877. 
7, ‘Primitivstreifen u. Neurula d. Wirbelthiere.’ By A. Rauber, Leipzig, 
1877. 
8. “On the Origin of Metameric Segmentation, &c.” By A. Sedgwick. 
‘Quart. Journ. Mier. Sci.,’ Jan., 1884. 
9. ‘*On the Fate of the Blastopore in the Newt, &c.” By Alice Johnson. 
Thid., 1884. 
10. “On the Development of Lacerta muralis.” By W. F. R. Weldon. 
Ibid., 1883. 
