EARLY ONTOGENETIC PHENOMENA IN MAMMALS. 17] 
Amphibia in preference to the cartilaginous fishes or to 
Amphioxus, however much more easy the latter material can 
be obtained. 
I have no doubt that in mammalian embryology very many 
surprises are yet in store for us. 
LITERATURE REFERRED TO. 
ASsSHETON, R. ’95.—Studies on the Development of the Rabbit and the 
Frog,” ‘ Quart, Journ. Mier. Sci.,’ vol. 37. 
—— ’'96a.—<The Primitive Streak of the Rabbit,” ‘Quart. Journ. Mier, 
Sci.,’ vol. 37. 
—— 7968.—* Note on the Ciliation of the Ectoderm of the Amphibian 
Embryo,” ‘ Quart. Journ. Mier. Sci.,’ vol. 38. 
— ’98.—*‘ An Account of a Blastodermic Vesicle of the Sheep of the 
seventh day with Twin Germinal Areas,” ‘Journ. Anat. and Phys.’ 
06.—* The Morphology of the Ungulate Placenta,” ‘ Phil. Trans. 
R.S. Londoa, vol. 198. 
Battowitz. ’01.—‘ Die Gastrulation der Ringelnatter,” ‘Zeitsch. f. wiss. 
Zool.,’ Bd. 70. 
Baspiert. ’06.—“Intorno alla placenta del Tragulus meminna, Erxl.,” 
‘ Anat. Anz.,’ Bd. 28. 
Bateson. *86.—‘‘Continued Account of the Later Stages in the Develop- 
ment of Balanoglossus Kowalevskii,” ‘Quart. Journ. Mier. Sci.’ 
vol. 26. 
Bettoncr. °84.—‘* Blastoporo e linea primitiva nei Vertebrati,” ‘ Atti del 
R. Acad. Lincei,’ Ser. 3, vol. 19. 
van BENEDEN. °80.—“ Recherches sur l’embryologie du lapin,” ‘Arch. de 
Biol.,’ vol. 1. 
—— ’88.—De la Formation et de la Constitution du placenta chez le 
Murin (Vespertilio murinus),” ‘Acad. de méd. de Belgique,’ 
Série 3, t. 15. 
——  °99—*Recherches sur les premiers stades du développement du 
murin (Vespertilio murinus),” ‘Anat. Anz.,’ Bd. 16. 
et Jutin. ’80.—‘‘ Observations sur la maturation etc., de l’ceu chez 
les Cheiroptéres,” ‘ Archives de Biologie,’ vol. 1. 
Biscnorr. °42.—‘ Entwickelungsgeschichte des Kaninchenies,’ Braun- 
schweig. 
