|Newborn and afterbirth of six-banded armadillo|
(Euphractus sexcinctus) from Chapman 1901
|Fetal membranes of a kangaroo (Macropus giganteus).|
Note the small allantois. From Chapman 1881
Chapman is notable for an early study of the fetal membranes of the Eastern grey kangaroo (Macropus giganteus). He noted that there was a large yolk sac but a relatively small allantois that did not form a placenta.
|Zonary placenta of an African elephant (Loxodonta africana)|
From Chapman c. 1880
Chapman got his armadillo and kangaroo specimens from the Philadelphia Zoo, but his African bush elephant (Loxodonta africana) placenta was from Cooper and Bailey’s London Circus. His was one of several early descriptions of elephant placentation, including a paper by Assheton (here), but there was then a hiatus until the classical work by Amoroso and Perry in 1964 (here). Based on the records of the elephant keeper, Chapman was able to estimate gestation to 650-655 days.
|Henry Cadwalader Chapman (1845-1910)|
Chapman came from a prominent Philadelphia family. His grandmother was a Biddle and her sister had married a Cadwalader, which may explain his middle name. He studied medicine then spent three years in Europe under Richard Owen in London and Alphonse Milne-Edwards in Paris.