Evolution

Cover Evolution
Evolution
James a S James Anderson Scott Watson
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Their blood system and their development would seem to suggest a descent from the ringed worms. On the other hand, their possession of a snout, and their very slight indication of division into segments, would seem to separate them from the group mentioned and to connect them rather with the Nemertines. The latter view is perhaps the more probable.
CHAPTER IV THE EARLY VERTEBRATES AND THE FISHES THE lowest of the vertebrates if indeed it can be called a verte- brate at all, seeing that it has n
...o vertebrae is the lancelet, Amphioxus. The common species of this animal (there are some eight in all) occurs in the sea off our own coasts, and is usually to be found half buried in the sand or mud of the sea floor. It is some two inches in length and has the shape of a laterally flattened cigar, and one of its very obvious features is the arrangement of the muscles in regular layers from front to back, in the same manner as those of a fish.
To describe some if its features in detail, the alimentary canal bears a somewhat striking similarity to that of Balanoglossus.


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