The evolution theory . Fm. 70 (repeated), Daph-. FiG. no. The largest of tlie Daphnids {Lepiodora Jujalina), with summerova {Ei) beneath the shell {Sch). I~IA, the appendages. 12, the oars (secondantennae) which always remain biramose in D^lphnids. sb, setse. ov, , ocsophiigus. Ma, stomach, a, anus. H, heart. Au, eye. nG, natural size. The largest of the Daphnida?, Leijtodora hyalina, a beautifullytransparent inhabitant of our lakes, which measures about a centi-metre in length (Fig. 110), also emerges from the sunnner egg as a perfectanimal, but from the winter egg, which floats f
The evolution theory . Fm. 70 (repeated), Daph-. FiG. no. The largest of tlie Daphnids {Lepiodora Jujalina), with summerova {Ei) beneath the shell {Sch). I~IA, the appendages. 12, the oars (secondantennae) which always remain biramose in D^lphnids. sb, setse. ov, , ocsophiigus. Ma, stomach, a, anus. H, heart. Au, eye. nG, natural size. The largest of the Daphnida?, Leijtodora hyalina, a beautifullytransparent inhabitant of our lakes, which measures about a centi-metre in length (Fig. 110), also emerges from the sunnner egg as a perfectanimal, but from the winter egg, which floats freely in the water andhas only a small provision of yolk, it emerges as a nauplius, which THE BIOGENETIC LAW Ig- tlien undergoes larval metamorpliosis before it becomes a perfectanimal (Fig. III). Fritz Miiller concluded from the repetition of the nauplius formin all orders of Crustaceans that the primitive form of the Crustaceanmust have been a nauplius, and that from it all the modern Crustaceansmust have evolved phyletically by the addition
Size: 2302px × 1085px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorthomsonj, bookcentury1900, bookdecade1900, bookyear1904
