acorn worms
Amphioxis slide
Amphioxis preserved
Amphioxis slide
Amphioxis head
Echidna - monotreme
Platypus - monotreme
Possum - marsupial
skunk and ground squirrel - placentals
Embryo 2-cell stage
Embryo 8-cell stage
Amphioxus
Morula
Amphioxus Blastula
Amphioxus model #12: Gastrula
Amphioxus model #17: Neural Plate
Amphioxus model #22: Nerve cord
Amphioxus
Frog early cleavage
Frog model #12: development cross section
48hr chick embryo whole mount
Chick cross section
Closeup of cross section
Lamprey
lamprey showing gills
lamprey saggital section
lamprey skeleton
Lamprey cross section
(male, left; female, right)
Lamprey cross section
(male)
Lamprey cross section
(female)
lamprey tail cross section
lamprey tail cross section
(slide)
lampey aammocoetes larva
ammocoetes cross section
(through gills)
ammocoetes cross section
(through gut)