ClipArt ETC
"Life history of a frog. Newly hatched forms hanging to water-weeds. Stages with external gills." -Thomson, 1916

Frog Stage 2

"Life history of a frog. Newly hatched forms hanging to water-weeds. Stages with external gills." -Thomson,…

"Young skate. The yolk-sac has been cut off, the yolk-stalk is left. m., Mouth; ol.o., nostril, e.g. "external gills", a., cloaca; c., claspers." -Thomson, 1916

Young Skate

"Young skate. The yolk-sac has been cut off, the yolk-stalk is left. m., Mouth; ol.o., nostril, e.g.…